Merge pull request #7 from bwrsandman/python3

Python3 Compatibility
Added arg iter
Redid Op Prec to match python
Add unittests

Prepare for travis testing with coverage
Fix running without numpy

Skip the only line which uses numpy in the module if numpy is not present
Add travis continuous integration tests

Add Makefile for building, testing, generating docs
Add tox configuration
Add more tests

Add test for:
    Add operation
    And operation
    Or operation
    Not operation