Merge pull request #3 from westonplatter/master

update ruby version to 2.0.0-p353
Remove dependency from zzet.common role
remove deprecated gems.github.com gem source
Move to new rubygems.org host and use SSL
Merge pull request #4 from wjessop/master

Modernise gemrc sources
Merge pull request #5 from westonplatter/master

update ruby-build to latest release
Upgrade default ruby
Bump default ruby-build
fix errors