title: No "accept merge request" button with developer level access
body: <p>I'm not seeing an "Accept Merge Request" button in gitlab despite having "Developer" level access. Instead there is this message:</p>
  
  <pre><code>Ready to be merged automatically
  
  Ask someone with write access to this repository to merge this request.
  </code></pre>
  
  <p>According to the documentation, users with "Developer" access have the ability to "manage merge requests", but this doesn't seem possible in this case. I have two "Developer" level users that are seeing this problem, one of which pushed the project to the gitlab instance to begin with. I assume he must have write access?</p>
  
  <p>Version information below</p>
  
  <pre><code>GitLab 7.14.3
  GitLab Shell 2.6.5
  GitLab API v3
  Ruby 2.1.6p336
  Rails 4.1.11 
  </code></pre>
  
  <p>Please let me know if any more info is required.</p>