Look for a suitable code review tool

This ticket functions as overview for results of testing out suitable code review tools suitable for the Tails project.

A list of existing OSS code review tools are:

• http://getbarkeep.org/
• http://crew-cr.org/
• http://www.reviewboard.org/
• http://phabricator.org/
• https://code.google.com/p/gerrit/

Related issues

• Related to #15186

Original created by @Dr_Whax on 6905 (Redmine)