Merge branch 'enable-asciidoctor-admonition-icons' into 'master'

Enable display of admonition icons in Asciidoc.

## What does this MR do?

Enables admonition icons to display in rendered asciidoc documents.

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

## Why was this MR needed?

Gitlab support of asciidoc needs a lot of improvements to make it useful in enterprise settings.

## Screenshots (if relevant)

![Screenshot_20161129_132250](/uploads/d280336000eb8b445d07d9bb2a2ed639/Screenshot_20161129_132250.png)

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

See merge request !7812

app/assets/stylesheets/framework.scss

@@ -6,6 +6,7 @@
 
 @import "framework/animations.scss";
 @import "framework/avatar.scss";
+@import "framework/asciidoctor.scss";
 @import "framework/blocks.scss";
 @import "framework/buttons.scss";
 @import "framework/calendar.scss";

app/assets/stylesheets/framework/asciidoctor.scss

+.admonitionblock td.icon {
+  width: 1%;
+
+  [class^="fa icon-"] {
+    @extend .fa-2x;
+  }
+
+  .icon-note {
+    @extend .fa-thumb-tack;
+  }
+
+  .icon-tip {
+    @extend .fa-lightbulb-o;
+  }
+
+  .icon-warning {
+    @extend .fa-exclamation-triangle;
+  }
+
+  .icon-caution {
+    @extend .fa-fire;
+  }
+
+  .icon-important {
+    @extend .fa-exclamation-circle;
+  }
+}

changelogs/unreleased/enable-asciidoctor-admonition-icons.yml

+---
+title: Enable AsciiDoctor admonition icons
+merge_request: 7812
+author: Horacio Sanson

lib/gitlab/asciidoc.rb

@@ -6,7 +6,7 @@ module Gitlab
   module Asciidoc
     DEFAULT_ADOC_ATTRS = [
       'showtitle', 'idprefix=user-content-', 'idseparator=-', 'env=gitlab',
-      'env-gitlab', 'source-highlighter=html-pipeline'
+      'env-gitlab', 'source-highlighter=html-pipeline', 'icons=font'
     ].freeze
 
     # Public: Converts the provided Asciidoc markup into HTML.