updated Ruby version from 1.9.3-p374 to p385
Merge pull request #91 from havenwood/patch-6

updated Ruby version from 1.9.3-p374 to p385
Version bump to 0.3.3.
Invoke ruby using the fully qualified path to avoid aliases.
Fix typo.
Silence stderr of which.
Added a description.
Added a description.
Renamed MRI_VERSION to RUBY_VERSION.
Naming.