Update twitter dependency to version 1.6.0
Update twitter dependency to version 1.6.0

sferik/sign-in-with-twitter,ksmetana/rails-app-twitter-test,sferik/sign-in-with-twitter,theonlyjames/garbage,arrogantgamer/ludum_dare_28,ksmetana/rails-app-twitter-test,arrogantgamer/ludum_dare_28,sferik/sign-in-with-twitter,theonlyjames/garbage