update twitter gem
add ruby2 message
add ruby2.0 to gemfile
removing newrelic gem temporarily (issue in heroku)
oops, adding forgotter gemfile.lock
removing activeadmin gem temporarily (issue in heroku)
oops, adding forgotten gemfile.lock
disable active_admin dependencies temporarily
reenable activeadmin dependencies
upgrade to activeadmin 0.5.1
update gem dependencies
sanitize gemfile, remove debug msg
prevent init app when precompiling assets in heroku
add ruby 2.0 to travis-ci config file