added gitter badge to repository
unit tests for git deploy plugin
added unit tests for Heroku deploy
unit tests for Tsuru plugin
removed unused deployment file stubs
moved modulus deploy to separate package with unit tests
fixed modulus typos
moved nodejitsu deploy to its own package with unit tests
removed modulus and jitsu from deployment package
ability to customize the session secret and expiration
Merge pull request #535 from bradrydzewski/master

working on unit tests for Deploy plugins + misc