Update mentionable shared examples to be (a bit) more understandable

These shared examples were super confusing, and honestly still kind of are, but they should be a bit better now.

I encountered a bunch of headaches in these examples while refactoring ReferenceExtractor, so that's how I ended up changing it.

See merge request !1780

Add default_url_options initializer

Fixes #2266

See merge request !1791

Use fixed width icons in all nav sidebars

| Before (watch the Network and Graphs icons as the sidebar collapses): | After: |
| :--------: | :------: |
|![Screen_Recording_2015-04-23_at_02.31_PM.mov](https://gitlab.com/gitlab-org/gitlab-ce/uploads/338aa382ff7609978cd900db29379f3f/Screen_Recording_2015-04-23_at_02.31_PM.mov.gif)|![Screen_Recording_2015-04-23_at_02.30_PM.mov](https://gitlab.com/gitlab-org/gitlab-ce/uploads/24af635f253688690b42da60271e7afb/Screen_Recording_2015-04-23_at_02.30_PM.mov.gif)|

Uses the `icon` helper, because I can't help myself!

See merge request !566

Fixes #2266

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

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

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

Fix broken link in jira service

Disable turbolinks for omniauth link to avoid rendering problems

Redirect to sign in page after signing out.

Addresses internal issue https://dev.gitlab.org/gitlab/gitlabhq/issues/2125.

See merge request !541

Fix two places where we should be using `Rails.env.development?`

See merge request !550

Fix bug causing at-username inside code blocks to sometimes be picked up as a user mention.

Addresses private issue https://dev.gitlab.org/gitlab/gitlabhq/issues/2254.

See merge request !553

Use `search_text_nodes` helper in our custom filters

Closes #1477

See merge request !561

New sidebar design

I want to make separation between sidebar and content

- [x] change sidebar and header colors
- [x] change colors for old light theme so it matches dark style too
- [x] rename theme names to something more reasonable
- [x] fix header logo collapse with JS
- [x] fix navless layouts (explore page, login page, snippets, user page)
- [x] fix tests

See merge request !558

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

Conflicts:
	app/controllers/snippets_controller.rb

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

Fix Node.js Error in Documentation

"Reply quoting selected text" shortcut/hotkey

Adds the <kbd>r</kbd> hotkey for quoting selected text on Issuable forms.

This MR also updates the jasmine gem and adds jasmine-rails to let us use the asset pipeline (and Coffeescript) in JS specs.

See merge request !1775

Add Fieldset Support to Project Services Views

Update command in upgrader docs to work with 7.10.0.

See merge request !562

Closes #1477

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

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

split field logic to separate template.

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

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

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

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

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

Updated Slack documentation

Fixes #2234

Updated the Slack documentation to include the new fields located in the service's settings.

/cc @karen

See merge request !1788