Add RailsConfig gem
Use Settings.doc.debug to determine docs debug output

This gives us more fine grained control on what we see in development
mode, and not get forced to see the debugging output when we don't want
to.

The default is set to 'true' to maintain the same behavior as before. It
can be overridden by copying settings.yml to settings.local.yml, and
then changing it to 'false'.
Disable doc debug mode by default in production and test
Merge pull request #483 from jamestyj/doc-dev

https://github.com/crowbar/barclamp-crowbar/pull/483

Merged by devtool for cloudedge