Added sqlite-devel dependency for Fedora/EL6 based systems.
Now installs rubygems from upstream git.  Works on CentOS 6.x.

Other distro's need testing, and maybe some adjustment.
Fix minor scripting error.
Updated the default Ruby version to 1.9.3-p362.
Merge pull request #5 from justinclift/fullcentosfix

Fixes the bundle install problem on CentOS 6.x.