Moves from removed 'rvm gem' command to 'gem'
Adds curl as dependency for ubuntu
using rvm <version> do gem
Merge pull request #12 from naps62/master

Moves from removed 'rvm gem' command to 'gem'
Add allow_prerelease option to gems

Some versions of some packages can be only installed with the --prerelease flag of gem install. Support this option.
Merge pull request #13 from jsoriano/patch-1

Add allow_prerelease option to gems
Merge branch 'master' of https://github.com/jfryman/puppet-rvm into merge-upstream
Merge pull request #3 from rji/merge-upstream

Merge changes from upstream