Add github API
set up github connection and load from env
add pull requester job

resolves #2
add tests for PR creation
fix deprecated task name
Merge branch 'master' into pull-request-worker

Conflicts:
	.gitignore
	Gemfile.lock
move webmock into test group only
handle failure if there are no changes

resolves #24
add oauth token to travis environment
Merge pull request #23 from theodi/pull-request-worker

Pull request worker