Added Ruby 2.1.2.
Updated the ChangeLog for 0.4.3.
Updated the ruby-install version in the README.
Added PGP signature for v0.4.3
Updated the homebrew formula for 0.4.3.
Updated the rpm spec for 0.4.3.
Added Ruby 2.0.0-p481.
Merge pull request #147 from spastorino/1.9.3_p481

Add Ruby 2.0.0-p481