Dev

Minify v0.1.9

ChangeLog:
* Fixed bug with optimizing images: if in css was not
result css file do not saves.
* Fixed bug with executing callback.
* Fixed bug with saving result css file.
* Added merge flag.
* Changed the way messages printing.
* Updated clean-css to v0.9.1.
* Beutified hashes.json format.
* Removed caching data for improving speed.
* Added bin directory and minify cmd tool.
* Fixed bug with calling callback after saving
minified file.
* Updated css-b64-images to v0.22.
* Update clean-css to v0.10.0.