Cache bundler
Cache bundler

Caches gems installed via bundler inbetween CI runs. Check http://docs.travis-ci.com/user/caching/#Caching-directories-(Bundler%2C-dependencies) for details.

hcool/steam-condenser-ruby,bfosberry/steam-condenser-ruby,jpalumickas/steam-condenser-ruby,Arie/steam-condenser-ruby,koraktor/steam-condenser-ruby,kickback/steam-condenser-ruby