Vendor ruby.rb from omnibus-software.

Source: https://github.com/opscode/omnibus-software/blob/7ac92daa6892e0898eb868679e578df530e38ee8/config/software/ruby.rb
Add ruby 2.1.4 version and sha.
Use ruby 2.1.4 for omnibus-gitlab.
Merge branch 'ruby2.1.4' into 'master'

Ruby 2.1.4

Fixes #314

See merge request !246