Merge branch 'save-button-color-application-settings' into 'master'

Save button on app settings now btn-save

Some save buttons where `btn-primary` where throughout the application these usually are `btn-save`.

Before (Application settings)

![Screenshot_from_2016-01-26_09-44-32](/uploads/f4019349c8bac6e0c91e23252a70d334/Screenshot_from_2016-01-26_09-44-32.png)

After

![Screenshot_from_2016-01-26_09-45-20](/uploads/8e59a2b180832f44e3908b22187549af/Screenshot_from_2016-01-26_09-45-20.png)


See merge request !2612

app/views/admin/application_settings/_form.html.haml

@@ -268,4 +268,4 @@
         = f.text_field :sentry_dsn, class: 'form-control'
 
   .form-actions
-    = f.submit 'Save', class: 'btn btn-primary'
+    = f.submit 'Save', class: 'btn btn-save'

app/views/admin/applications/_form.html.haml

@@ -22,5 +22,5 @@
           %code= Doorkeeper.configuration.native_redirect_uri
           for local tests
   .form-actions
-    = f.submit 'Submit', class: "btn btn-primary wide"
+    = f.submit 'Submit', class: "btn btn-save wide"
     = link_to "Cancel", admin_applications_path, class: "btn btn-default"

app/views/admin/groups/_form.html.haml

@@ -21,6 +21,5 @@
 
   - else
     .form-actions
-      = f.submit 'Save changes', class: "btn btn-primary"
+      = f.submit 'Save changes', class: "btn btn-save"
       = link_to  'Cancel', admin_group_path(@group), class: "btn btn-cancel"
-