Add rubygems_version attribute to rvm_ruby resource

This currently affects only the initial installation of the ruby.
Changes to work with Omnibus and chef_gem
Fix for rvm_gem with omnibus, causing issues for gems with native extensions
allows for universal rvmrc settings to be used in the user_install
No. More. rubygems-bundler.
Update README.md

Add missing comma
Fixed https://github.com/fnichol/chef-rvm/issues/121
Refactor rake and foodcritic tasks.
FC045: set name attribute in metadata.rb.
Reformat metadata.rb.
FC001: prefer strings in node attributes (for now, for consistency).
FC009: un-confuse foodcritic with method-scoped variables.
Update CHANGELOG.md.
Merge pull request #129 from zacharydanger/patch-1

Update README.md - missing comma
Update CHANGELOG, thanks and welcome @zacharydanger!
Merge pull request #134 from mveytsman/master

Fix vagrant_ruby default location
Update CHANGELOG, thanks and welcome @mveytsman!
Fix convergence failure.
apply ruby patchsets
update rvm requirements