Few responsive fixes

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

app/views/projects/issues/_issue_context.html.haml

@@ -11,7 +11,7 @@
     = link_to_member(@project, @issue.assignee)
 
 
-  .pull-right.hidden-sm
+  .pull-right.hidden-sm.hidden-xs
     - if issue.milestone
       - milestone = issue.milestone
       %cite.cgray Attached to milestone

app/views/projects/merge_requests/show/_mr_title.html.haml

@@ -34,7 +34,7 @@
           %i.icon-edit
           Edit
 
-.votes-holder
+.votes-holder.hidden-sm.hidden-xs
   #votes= render 'votes/votes_block', votable: @merge_request
 
 .back-link