Require messenger classes manually
gitignore Gemfile.lock
Remove hard dependency on resque and system_timer
Move development dependencies to gemspec

Swap ruby-debug for pry and remove ZenTest.
Use curb instead of net/http and webmock for tests
Update spec_helper

Add support module for stubbing login request
Change Cheetah::Messenger to use curl

Cleanup exception raising in Messenger#do_post