Merge pull request #2 from JohnDvorak/develop

Patch-2 - Client API Initial Implementation.
Added initial Receipt and CMSG implementations.
Minor bug fixes.
Bad global references now point to class variables. Inversed name filter to correctly prune all but hash files. Dict iteritems method switched to items() in 3.*.
Add pycache to gitignore.
Merge pull request #2 from dstar4138/develop

merge changes from develop branch