Add more information into RSS fead for issues

There is an RSS feed for issues: https://gitlab.com/gitlab-org/gitlab-ce/issues.atom

Example of an issue is:

 <entry>
    <id>https://gitlab.com/gitlab-org/gitlab-ce/issues/14548</id>
    <link href="https://gitlab.com/gitlab-org/gitlab-ce/issues/14548"/>
    <title>Font hard to read + too much whitespace</title>
    <updated>2016-03-23T17:22:50Z</updated>
    <media:thumbnail width="40" height="40" url="https://secure.gravatar.com/avatar/f4cfb54a6cf52a5f4cc8945f7d827ec5?s=80&amp;d=identicon"/>
    <author>
      <name>Amanda Folson</name>
      <email>amanda@gitlab.com</email>
    </author>
    <summary>Font hard to read + too much whitespace</summary>
  </entry>

It would be great, if <entry> block includes:

Issue text (Description).
Labels (if any).
Weight (if any).
Milestone (if any).
Assignee (if any).
Due date (if any).