Track code coverage of the unit tests by means of coverage and coveralls

[evilaliv3]

It would be great if the library could track the code coverage of the unit tests by means of coverage and coveralls that is free for an opensource project like your: https://coveralls.io/

This way we could avaluate the integration of library inside GlobaLeaks.

Examples on how to do this could be found in: https://github.com/dchest/scrypt-async-js