* Add yarn module based off of NPM module, adjust syntax for install cmd
* Update author list
* Add Return docbloc
* Remove extra var assignment
* Always return output without emojis, small changes for yarn 0.16.1
* Move import line, add ANSIBLE_METADATA, bump version_added
* Updating module format to meet newest lint requirements. Update options and example docs.
* Bring back RETURN block and main() execution.
* All trailing whitespace removed.
* Remove json try/except.
* Add initial pass at setting up Yarn integration tests.
* Add better handling for latest and removal states. Add tests for upgrading a single package.
* Fix issue where state=latest for installing all packages caused failure.
* Set yarn bin to latest version for tests. Fix sanity tests.
* Switch template task to copy task in yarn integration tests.
