Merge pull request #1 from kornypoet/master

Support reverse trigger
Move reverse trigger code to maintain alphabetical order
Make quotes and braces consistent with the rest of the code
Make the reverse trigger better match jenkins-job-builder's names

The option keys are thus `jobs:` and `result:` instead of `watch_projects:`
and `trigger_on:`.
Add an endToEnd acceptance test for the reverse trigger
Clean up documentation for reverse trigger
Add to the Contributing section in the README
Bump version to 0.7.0
Support the throttle property
Update the list of sections and components in the README
Bump the version to 0.8.0.