use octokit 3.4.0
don't hardcode the octokit version in tests
upgrade warden-github to handle gravatar url deprecation
Merge pull request #89 from ZeroFucks/upgrade-gems

Upgrade gems
change heroku deploy button to svg version
Merge pull request #90 from bgentry/heroku-button-sv

change heroku deploy button to svg version
Read deployment task name from correct place

Fixes #91.
Merge branch 'task-data' into flowdock