Update rack-mount dependency to version 0.7.4
Update rack-mount dependency to version 0.7.4

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