Merge branch 'fix/font-awesome' into 'master'

Fix Enterprise Project Settings Icons

Font awesome was upgraded in CE and the corresponding enterprise project settings icons 'Groups' and 'Git Hooks' were not displaying any icon. The groups icon is exactly as it was pre-7.5. The git hooks icon is much different in the new font-awesome and did not make sense anymore. They do have a generic 'git' icon which I have included here and think looks nice.

## Pre-7.5:
![Screen Shot 2014-11-21 at 5.14.07 PM](https://gitlab.com/uploads/subscribers/gitlab-ee/12c3034fef/Screen_Shot_2014-11-21_at_5.14.07_PM.png)

## 7.5:
![Screen Shot 2014-11-21 at 5.14.24 PM](https://gitlab.com/uploads/subscribers/gitlab-ee/4f97728c19/Screen_Shot_2014-11-21_at_5.14.24_PM.png)

## After this merge request:
![Screen Shot 2014-11-21 at 5.14.17 PM](https://gitlab.com/uploads/subscribers/gitlab-ee/09b06bfddc/Screen_Shot_2014-11-21_at_5.14.17_PM.png)

See merge request !24

app/views/projects/_settings_nav.html.haml

@@ -9,7 +9,7 @@
       Members
   = nav_link(controller: :group_links) do
     = link_to project_group_links_path(@project) do
-      %i.icon-share
+      %i.fa.fa-share-square-o
       Groups
   = nav_link(controller: :deploy_keys) do
     = link_to project_deploy_keys_path(@project) do
@@ -21,7 +21,7 @@
       Web Hooks
   = nav_link(controller: :git_hooks) do
     = link_to project_git_hooks_path(@project) do
-      %i.icon-upload
+      %i.fa.fa-git-square
       Git Hooks
   = nav_link(controller: :services) do
     = link_to project_services_path(@project) do