Merge branch 'last-push-vertical-alignment' into 'master'

Aligns create merge request button vertically

## What does this MR do?

Based on https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4644#note_12507178 I have vertically aligned the button correctly.

## Screenshots (if relevant)

Here is my awesome screenshot to show it is centered vertically 

![Screen_Shot_2016-06-17_at_10.17.19](/uploads/e7bf5bcc5b254ed4db376c16460d79a5/Screen_Shot_2016-06-17_at_10.17.19.png)

See merge request !4733

app/assets/stylesheets/pages/events.scss

@@ -136,9 +136,10 @@
 .event-last-push {
   overflow: auto;
   width: 100%;
+  
   .event-last-push-text {
     @include str-truncated(100%);
-    padding: 5px 0;
+    padding: 4px 0;
     font-size: 13px;
     float: left;
     margin-right: -150px;