fix async.parallel callback
Merge pull request #3 from apoleshchuk/retina-async-fix

fix async.parallel callback
Changelog.
v0.0.7
save variables to json file
Update readme
Merge pull request #4 from apoleshchuk/stylus-hash

Stylus hashes support via json file
Add JSCS, update deps.
Fix typos.
Add Travis.
Add banners to Readme.
Changelog.
v0.1.0