Merge pull request #12 from wiggzz/devel

Devel
Merge pull request #13 from wiggzz/devel

modified onehash to internally use byte arrays for storing digests/hashe...
Merge branch 'devel' of https://github.com/storj/heartbeat into devel
Merge pull request #16 from wiggzz/devel

Added support for JSON serialization of objects via todict() and fromdict() methods
Merge branch 'devel' of https://github.com/storj/heartbeat into devel
added a couple of tests.