Lock to Ruby 2.0.0 instead of 2.0.0-p0 .
Build against ruby-2.0.0,1.9.3 jruby-19mode (failok) rbx-19mode (failok).

Remove ruby-1.9.2 from build list.
Update gemspec metadata and lock to redis 3.x instead of 3.0.x .
Update README, adding badge.fury,codeclimate, rearranging.