Up the number pooled database connections
Switch to using prebuilt Ruby 2.0 packages for redhat and centos.

Goodbye, RVM.  Instead, we will use prebuilt packages from
http://opencrowbar.s3-website-us-east-1.amazonaws.com/ocb/

These packages are built and will be maintained by the OpenCrowbar
development team.
Merge pull request #89 from VictorLowther/use-prebuilt-ruby2-for-centos-and-redhat

Use prebuilt ruby2 for centos and redhat