Add coveralls support.
Add coverage report badge to readme.
Merge pull request #1 from serathius/init

Init package configuration
Merge pull request #2 from serathius/coveralls

Coveralls
Implement basic range verificator.
Implement disk volume class.
Add mock to requirements.
Refactor. Move.
Refactor.
Add value extractors.
Add System Verificators.
Implement disc volume class.
Add file system backend.
Refactor.
Add description to value extractor.
Refactor.
Add specialized exceptions for RangeVerificator boundries.
Add Logger.
Add verification suit.
Add date to verification suit.