Fix bug where Wiki pages that include a '/' were no longer accessible

### What does this MR do?

This MR fixes a regression that caused Wiki pages that included a '/' to no longer be accessible.

### Are there points in the code the reviewer needs to double check?

Are there cases that `wiki_helper.rb` doesn't handle?

### Why was this MR needed?

The upgrade from Rails v4.1.2 to v4.1.9 (76aad9b7) caused slashes in a model ID to be escaped automatically. We can no longer use the built-in the URL helpers to generate the links for Wiki pages if we want to maintain support for slashes. There is no option to tell the formatter otherwise:

http://stackoverflow.com/questions/25031791/rails-4-1-2-to-param-escapes-slashes-and-breaks-app

The Rails code in question is here:

https://github.com/rails/rails/blob/4-1-stable/actionpack/lib/action_dispatch/journey/visitors.rb#L159

### What are the relevant issue numbers / [Feature requests](http://feedback.gitlab.com/)?

#1363

See merge request !502

Move project file links to tab bar.

The sidebar was getting awfully crowded, so I moved the file links to the tab bar alongside Activity and Readme. Unlike Readme, these files are not actually loaded in a tab, but simply link to the relevant blob, because we don't want to unnecessarily load the potentially large changelog or contribution guide on every project page load.

![Screen_Shot_2015-04-06_at_15.04.21](https://gitlab.com/gitlab-org/gitlab-ce/uploads/962e8073ab6dc8797f93ee754eb275ed/Screen_Shot_2015-04-06_at_15.04.21.png)

See merge request !497

Corrected steps for creating a patch release

Added step to bump all versions (CE, EE, CI) every time there is a patch release and the reasoning behind it

See merge request !1754

Make the "New Application" form's error messages visible

Prior, if you submit the form without values the error text and the form fields were white-on-white:

![Screen_Shot_2015-04-01_at_8.25.56_PM](https://dev.gitlab.org/gitlab/gitlabhq/uploads/17eb44e65fc9c5ddd4a529e3927cd9b6/Screen_Shot_2015-04-01_at_8.25.56_PM.png)

After:

![Screen_Shot_2015-04-06_at_10.13.07_PM](https://dev.gitlab.org/gitlab/gitlabhq/uploads/be53d6971ec1c34f415e75a0307b6577/Screen_Shot_2015-04-06_at_10.13.07_PM.png)

See merge request !1752

Render a 404 when RefsController#logs_tree gets an HTML request

Fixes #2152

See merge request !1748

Improve wording below signup box

Before:

![Screen_Shot_2015-04-07_at_5.46.31_PM](https://dev.gitlab.org/gitlab/gitlabhq/uploads/a5433c7c423fd37cffe4c2352a833dcf/Screen_Shot_2015-04-07_at_5.46.31_PM.png)

After:

![Screen_Shot_2015-04-07_at_5.45.05_PM](https://dev.gitlab.org/gitlab/gitlabhq/uploads/46e13756a8dc389e6f87de0097433e36/Screen_Shot_2015-04-07_at_5.45.05_PM.png)

See merge request !1755

Typo -- findAndollowLink -> findAndFollowLink

Pushed here to get working CI.

See merge request !1750

add necessary dir for uploads in update to 6.7

Documentation on how to fork a project

Added documentation on how to fork a project.

/cc @sabba

See merge request !1623

[ci skip]

Added step to bump all versions (CE, EE, CI) every time there is a patch release and the reasoning behind it

Closes #1363

Lower the pointHitDetectionRadius for commit charts

Needed to update the Chart.js dependency as well.

Fixes #2088

See merge request !1749

Add icons to Add dropdown items.

Before:

![Screen_Shot_2015-04-06_at_15.15.44](https://gitlab.com/gitlab-org/gitlab-ce/uploads/a9f7d2e5dbd604fe7dff03cd7e47860e/Screen_Shot_2015-04-06_at_15.15.44.png)

After:

![Screen_Shot_2015-04-06_at_15.15.34](https://gitlab.com/gitlab-org/gitlab-ce/uploads/c5be6cdbe32d1064da7497a1879a9eb3/Screen_Shot_2015-04-06_at_15.15.34.png)

See merge request !498

Fix final line in EmailsOnPush email diff being rendered as error.

Fixes https://github.com/gitlabhq/gitlabhq/issues/8976 and private issue https://dev.gitlab.org/gitlab/gitlabhq/issues/2194.

Pulls in gitlab_git 7.1.5, which includes https://gitlab.com/gitlab-org/gitlab_git/merge_requests/18.

See merge request !480

Add event to activity feed for imported projects.

![Screen_Shot_2015-04-06_at_14.51.16](https://gitlab.com/gitlab-org/gitlab-ce/uploads/07fd16cb558873d2a6fb6c3cfcfdb227/Screen_Shot_2015-04-06_at_14.51.16.png)

See merge request !496

Fixes #2088

Fixes #2152

remove extra scrollbar on background jobs tab

Remove sidekiq-limit_fetch because it require Redis 2.6.

See merge request !491

Updated CHANGELOG for !214

Forgot to update the CHANGELOG for !214. Prompted by @dblessing to submit this MR to fix that.

See merge request !493