Merge pull request #31 from codez/rails3-handle-failing-requests

Handle failing requests for Rails 3
latest change should work for rails3 and not fail rails2
update Gemfile source because bundler is :facepunch:
Bump to version 0.5.1
add delete requests to the end of the queue
process queue fifo style
consistently use strings for method values
test queue ordering
use #meth instead of #method in FormSubmission