Remove json dependency
Add Ruby 2.1.0 to Travis CI mix.
ignore .bundle directory
Add rubysl-json dependency for RBX
Remove rubysl-json dependency, as it's been pulled.
Remove rubysl dependencies from gemspec and add generic for rbx platform in Gemfile.
Have travis cache bundler.
Remove rubinius stuff from gemspec (now in Gemfile).
Remove explicit dependency on json from writer.
Merge pull request #8 from gkellogg/master

Removed the JSON gem dependency.