Merge branch 'mobile-ui-improvements' into 'master'

Mobile ui improvements

* Fixes blob view - https://twitter.com/jamesgecko/status/466675058664951808
* Hide project sidebar for xs
* Hide group activity for xs

app/views/groups/show.html.haml

 .dashboard
-  .activities.col-md-8.hidden-sm
+  .activities.col-md-8.hidden-sm.hidden-xs
     - if current_user
       = render "events/event_last_push", event: @last_push
       = link_to dashboard_path, class: 'btn btn-tiny' do

app/views/projects/blob/_blob.html.haml

@@ -15,18 +15,18 @@
       - else
         = link_to title, '#'
 
-%ul.blob-commit-info.bs-callout.bs-callout-info
+%ul.blob-commit-info.bs-callout.bs-callout-info.hidden-xs
   - blob_commit = @repository.last_commit_for_path(@commit.id, @blob.path)
   = render blob_commit, project: @project
 
 %div#tree-content-holder.tree-content-holder
   .file-holder
-    .file-title
+    .file-title.clearfix
       %i.icon-file
       %span.file_name
         = blob.name
         %small= number_to_human_size blob.size
-      %span.options= render "actions"
+      %span.options.hidden-xs= render "actions"
     - if blob.text?
       = render "text", blob: blob
     - elsif blob.image?

app/views/projects/show.html.haml

@@ -6,7 +6,7 @@
     = render 'shared/event_filter'
     .content_list
     = spinner
-  .col-md-3.project-side.hidden-sm
+  .col-md-3.project-side.hidden-sm.hidden-xs
     .clearfix
       - if @project.archived?
         .alert.alert-warning