Fix broken code import and display error messages if something went wrong with creating project

Clicking "Import" in Bitbucket import status page would result in:

```
  Rendered import/base/create.js.haml (38.3ms)
Completed 500 Internal Server Error in 1362ms (ActiveRecord: 20.2ms)

NoMethodError - undefined method `namespace_projects_path' for #<#<Class:0x007fd6c0f29498>:0x007fd6c0cf09d8>:
  actionpack (4.1.11) lib/action_dispatch/routing/polymorphic_routes.rb:142:in `polymorphic_url'
  actionpack (4.1.11) lib/action_dispatch/routing/polymorphic_routes.rb:148:in `polymorphic_path'
  actionview (4.1.11) lib/action_view/routing_url_for.rb:87:in `url_for'
  turbolinks (2.5.3) lib/turbolinks/xhr_url_for.rb:12:in `url_for_with_xhr_referer'
  actionview (4.1.11) lib/action_view/helpers/url_helper.rb:181:in `link_to'
  app/views/import/base/create.js.haml:23:in `_app_views_import_base_create_js_haml__1092746368522631377_70280180507700'
  actionview (4.1.11) lib/action_view/template.rb:145:in `block in render'
  activesupport (4.1.11) lib/active_support/notifications.rb:161:in `instrument'
  actionview (4.1.11) lib/action_view/template.rb:339:in `instrument'
  actionview (4.1.11) lib/action_view/template.rb:143:in `render'
  rack-mini-profiler (0.9.0) lib/mini_profiler/profiling_methods.rb:108:in `block in profile_method'
  actionview (4.1.11) lib/action_view/renderer/template_renderer.rb:55:in `block (2 levels) in render_template'
  actionview (4.1.11) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
  activesupport (4.1.11) lib/active_support/notifications.rb:159:in `block in instrument'
  activesupport (4.1.11) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  activesupport (4.1.11) lib/active_support/notifications.rb:159:in `instrument'
```

Also, if the project failed to save for some reason, the user was never informed. Screenshot of new error message dump:

![image](https://gitlab.com/stanhu/gitlab-ce/uploads/afc15aa6b0cde0080976eab3199cf18b/image.png)

Closes #2241

See merge request !1134

Disable turbolinks when linking to Bitbucket import status

Turbolinks was causing issues with the Bitbucket JavaScript/display because it
was trying to intercept `/import/bitbucket/status` even when a 302 redirection occurred:

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/18a8a76bb99a2c9accb0805c23785c1e/image.png)

Closes #2241

See merge request !1131

Add README to list of files in project page if activity feed setting in use

Closes #2044

Screenshot:

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/7da17d8d8172f86965af15fd563d181a/image.png)

See merge request !1021

Clicking "Import" in Bitbucket import status page would result in:

```
  Rendered import/base/create.js.haml (38.3ms)
Completed 500 Internal Server Error in 1362ms (ActiveRecord: 20.2ms)

NoMethodError - undefined method `namespace_projects_path' for #<#<Class:0x007fd6c0f29498>:0x007fd6c0cf09d8>:
  actionpack (4.1.11) lib/action_dispatch/routing/polymorphic_routes.rb:142:in `polymorphic_url'
  actionpack (4.1.11) lib/action_dispatch/routing/polymorphic_routes.rb:148:in `polymorphic_path'
  actionview (4.1.11) lib/action_view/routing_url_for.rb:87:in `url_for'
  turbolinks (2.5.3) lib/turbolinks/xhr_url_for.rb:12:in `url_for_with_xhr_referer'
  actionview (4.1.11) lib/action_view/helpers/url_helper.rb:181:in `link_to'
  app/views/import/base/create.js.haml:23:in `_app_views_import_base_create_js_haml__1092746368522631377_70280180507700'
  actionview (4.1.11) lib/action_view/template.rb:145:in `block in render'
  activesupport (4.1.11) lib/active_support/notifications.rb:161:in `instrument'
  actionview (4.1.11) lib/action_view/template.rb:339:in `instrument'
  actionview (4.1.11) lib/action_view/template.rb:143:in `render'
  rack-mini-profiler (0.9.0) lib/mini_profiler/profiling_methods.rb:108:in `block in profile_method'
  actionview (4.1.11) lib/action_view/renderer/template_renderer.rb:55:in `block (2 levels) in render_template'
  actionview (4.1.11) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
  activesupport (4.1.11) lib/active_support/notifications.rb:159:in `block in instrument'
  activesupport (4.1.11) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  activesupport (4.1.11) lib/active_support/notifications.rb:159:in `instrument'
```

Closes #2241

Doc: Fix link to gravatar.com

See merge request !1133

Fix instructions for empty repo + existing files

Fixes #2242

See merge request !1132

Fixes #2242

Turbolinks was causing issues with the Bitbucket Javascript/display because it
was trying to intercept /import/bitbucket/status even when a 302 redirection occured.

Closes #2241

Add dropzone upload progress to CHANGELOG

This MR adds dropzone upload progress entry to CHANGELOG.
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/1125#note_1865958

See merge request !1130

Fix diff syntax highlighting

### What does this MR do?

This MR fixes a syntax highlighting issue that that manifested itself when a user tried the following:

```
+aaa
+bbb
 ccc
```

However, a regression in 0abe98f0 caused the last line to be put on the second to last line:

![image](https://gitlab.com/stanhu/gitlab-ce/uploads/a16515499d5e3fd9737370d89c73f671/image.png)

Instead of this:

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/59eca6efd4c290aa633b9fb54c98a70e/image.png)

This bug occurred because of some error in the logic of handling new lines in the content. Refactored HTML parser to avoid duplication of newline parsing.

### What are the relevant issue numbers?

Closes #2235

See merge request !1126

Refactored HTML parser to avoid duplication of newline parsing.

Closes #2235

Closes #2044

Fix corrupted binary files when using API files endpoint

Closes #2219

See merge request !1123

Improve text of MR merge widget and manual merge modal

Modal with manual merge instructions:

![Screen_Shot_2015-08-08_at_21.30.23](https://gitlab.com/gitlab-org/gitlab-ce/uploads/2bffe42e9ad76afd02efbe5816027767/Screen_Shot_2015-08-08_at_21.30.23.png)

Archived:

![archived](https://gitlab.com/gitlab-org/gitlab-ce/uploads/e1efa1d54ce7ead8de6e88ca34095c09/archived.png)

WIP:

![wip](https://gitlab.com/gitlab-org/gitlab-ce/uploads/14a831458d0946722559ec643f91678c/wip.png)

Missing target branch:

![missing_branch](https://gitlab.com/gitlab-org/gitlab-ce/uploads/340083bbacbc234906e58cf76c586a9e/missing_branch.png)

Missing source branch:

![missing_branch_source](https://gitlab.com/gitlab-org/gitlab-ce/uploads/72f80ed58efed88b2bbcf403b55b1a01/missing_branch_source.png)

Nothing to merge:

![nothing](https://gitlab.com/gitlab-org/gitlab-ce/uploads/85b0d9da87acacd53cffd0df58d8eed4/nothing.png)

Checking ability to merge:

![check](https://gitlab.com/gitlab-org/gitlab-ce/uploads/32d75322e622025610c446e8ca7d892d/check.png)

Conflicts when allowed to merge:

![conflicts](https://gitlab.com/gitlab-org/gitlab-ce/uploads/23fdb2c60a27d873b3cc8a008203eb59/conflicts.png)

Conflicts when not allowed to merge:

![conflicts_not_allowed](https://gitlab.com/gitlab-org/gitlab-ce/uploads/113462a80fc65bf48b20dc0efd808363/conflicts_not_allowed.png)

Mergeable when allowed to merge:

![accept](https://gitlab.com/gitlab-org/gitlab-ce/uploads/1b3bb1a71df21728fe9318e7a083bfba/accept.png)

Mergeable when not allowed to merge:

![not_allowed](https://gitlab.com/gitlab-org/gitlab-ce/uploads/d38fa5c96f8f9d7223bb6bc7ad36f29d/not_allowed.png)

Merge in progress:

![locked](https://gitlab.com/gitlab-org/gitlab-ce/uploads/b60dcf5eb70e6032b0e8aac766018df3/locked.png)

Merge failed:

![failed_2](https://gitlab.com/gitlab-org/gitlab-ce/uploads/3713b9a10298183935b028b658271ac9/failed_2.png)

Merged:

![merged](https://gitlab.com/gitlab-org/gitlab-ce/uploads/7f68a48dd197a71351c9a80c59c8ecbe/merged.png)

Closed:

![closed](https://gitlab.com/gitlab-org/gitlab-ce/uploads/d5ce040449b7db943bd2fbfffb607a10/closed.png)

cc @dzaporozhets @rspeicher

See merge request !1120

Trigger post-receive hooks after commits are made by GitLab
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !1127

Fix event cache

Fixes #2236.

See merge request !1128

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Add dropzone upload progress

This MR adds upload progress in percents to dropzone.

![progress](https://gitlab.com/vernik91/gitlab-ce/uploads/9be251e4f3a99bc1d65435b1f001d021/progress.png)

I thought, it can be nice small enhancement :)

See merge request !1125

Add `data-[type]-id` attribute to reference links

This is to let us redact them later in another filter.

See merge request !1110

link to configured gravatar host on profile page

This MR updates the profile page to display the correct address for the configured gravatar service. Previously this always showed gravatar.com even if gravatar.com was not being used as the gravatar service.

See merge request !1093

Add CHANGELOG for gitlab_git 7.2.9 updates

Closes #2219

Ui improvements

* revert of wrong patch
* spall margin change

Explanation with screenshots here - https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/579#note_1845510

See merge request !1117

Improve abuse report wording

Fix transparency for msapplication-tile image

See merge request !1122

Cache all events

Use CSS to determine if the current user needs to see "Congratulations! Tweet about it" by project creation events and "Create Merge Request" by push events.

Implemented as described here: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/911#note_1559710

Addresses #2054, in part.

cc @dzaporozhets 

See merge request !1103

[ci skip]

This is to let us redact them later in another filter.