Fix encoding of output of markup, prevent 500 for non-ascii characters

#### What does this MR do?

This MR forces the output of `Github::markup` to have the same encoding as the input to it.

#### Why was this MR needed?

This prevents 500 errors if the markup contains non-asci characters.

#### What are the relevant issue numbers / Feature requests?

This MR closes

* #296
* https://github.com/gitlabhq/gitlabhq/issues/7023

/cc @jacobvosmaer

See merge request !160

Add retry option of travis and bundler

Turn if/else branch for valid compare error message

Improve readme markup,  fixes #7455

This reverts commit a5473561.
Because grit does not respect offset setting when follow: true which
cause invalid commit history for file

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

Fix 500 on searching on empty project, restyle search page

Prevent 500 if hook url is down when testing a hook, fixes #7376

history for files follows after rename

Disable 'Save changes' button if input is empty, fixes #6351

Use ruby 1.9 syntax

Merge branch 'add_complete_commit_message_to_api' of https://gitlab.com/christian.taedcke/gitlab-ce into christian.taedcke/gitlab-ce-add_complete_commit_message_to_api
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Conflicts:
	CHANGELOG

Fix hound

Less chatty HipChat intergation

The HipChat integration is noisy. In our team it constantly overwhelms the channel with a lot of commits or the bodies of their messages. It's very easy to loose the actual conversation in the midst of this.

This request does two things:

* Limit the number of shown commits on every push
* Display only the first line (the subject) of each commit messages

We tried it and found it was nicer for us 😄

See merge request !159

Let users limit by archived/not archived projects in GitLab API GET /projects

Adds a boolean parameter, archived, to the /projects endpoint.

See merge request !158

Better formulated memory requirements

See merge request !1010

Sidekiq and ram

/cc @jacobvosmaer

See merge request !1011

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

Improve test env

* Replace big gitlabhq repo with small one (https://gitlab.com/gitlab-org/gitlab-test)
* dont stub gitlab-shell calls

Advantages:

* test gitlab-shell install during tests
* test integration with gitlab-shell features (fork, change default branch etc)
* don't store archive with test repo inside gitlab
* less stubs - easier to write/read tests

During this refactoring __next issues are be fixed__:

* satellite error if gitlab_shell path is relative
* project rename repo -> 500 error
* fixed wrong diff for MR `download plain diff`
* fixed bug when gfm ignores `@ref` variable during link parsing

Fixes #1451

See merge request !1005

Explain that sidekiq doesn't eat as much ram as some people seem to suspect https://twitter.com/khrogos/status/498062432938782720

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

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

make bullet punctuation on protected branches page consistent

Fix spelling errors in documentation

Further changes

add application check commands to 5.0 to 5.1 upgrade guide

Make file edit error message less specific

See merge request !1007

The truth is that at the point where there error message is written we
can only guess what went wrong.