Adds lograge gem for condensed logging

Pivotal Tracker story: https://www.pivotaltracker.com/story/show/66568320

Have Papertrail filter noise, such as requests for static assets. http://blog.papertrailapp.com/more-signal-less-noise-with-simple-free-log-filtering/

Denser logging. Many Web frameworks (including Rails) are very verbose. Here's how to make Rails logs more useful and denser in 2 minutes. http://help.papertrailapp.com/kb/configuration/controlling-verbosity

Related:
https://github.com/g5search/g5-content-management-system/pull/238