Add support for RhodeCode

[rybak]

Overview

• Documentation
  • https://code.rhodecode.com/
  • https://en.wikipedia.org/wiki/RhodeCode

We might also consider supporting Kallithea, which is a fork of RhodeCode.

Public instances

• https://code.rhodecode.com
  • Self-hosted: https://code.rhodecode.com/rhodecode-enterprise-ce

Example URLs for testing

• Git: https://code.rhodecode.com/ci-notify/changeset/4adc29a0bea2578f923cddef339d0528edf73d45
• Mercurial: https://code.rhodecode.com/ci-notify/changeset/4adc29a0bea2578f923cddef339d0528edf73d45
• SVN: https://code.rhodecode.com/svn-doc/changeset/1

Screenshot

The button might fit well in the right hand side cluster of buttons, near the button "Copy the full commit id" and the permalink.