0.2.0 release

Fixes #4 

## Todo
- [x] #4 - Flag to bypass versioning

~~#5 - Add source maps support~~ Going to need to look a lot more into this. It will be added later.

## Minor release updates
* Replaced `versioningParent` option in uglify and cssmin tasks with `key` option directly in the `versioning` task
* Each outputted file is now in a separate target. This will allow future integration with source maps.
* Added `bypass` option to skip versioning a specific file