Fix python3 compatibility

Fix Module imports
Replace deprecated dict.has_key call
Use print functions
Alias xrange for range in python3 where they do the same thing
Alias basestring for python3 which combines unicode and str into str
Split __cmp__ into __lt__ and __eq__because __cmp__ is deprecated in python3
Replace operations.div by operations.truediv because the prior is deprecated in python3
Add requirements file for pip install -r requirements.txt which is pretty standard for python projects.
Add language classifier information
Set zip_safe=False to avoid errors while installing
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