Now compatible from Python 2.6-3.4 with all unit tests passing.

Hi
I've refactored most of the incompatibility issues, and package runs on Python 2.6, 2.7, 3.3, and 3.4. Here are some changes i've made.

[![Build Status](https://travis-ci.org/jjangsangy/disqus-python.svg?branch=master)](https://travis-ci.org/jjangsangy/disqus-python)
Changelog
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* Added Travis-CI Integration
* General Bug/Compatibility Fixes
    * `+# -*- coding: utf-8 -*-` and `from __future__ import` idioms
* Supports wheel binary specification
* Removed depreciated modules e.g. `pkg_resources`
* Cleanup of `__init__.py`
* Added `requirements.txt` & `test_requirements.txt`
* Added Makefile for automation
* Created `__version__.py` as single authoritative reference of version \#

Some additional refactoring that would be useful
TODO:
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* Documentation, maybe just pulling the docstrings with Sphinx Autofunc
* Moving rest of code out of `__init__.py`
* Complete refactor of `setup.py`
* Authentication without secret key, or some cryptography.
* A `CONTRIBUTE.in` file
* Remove `simplejson` dependency 
Can we yank a couple helpers from six so this has the same semantics in both python 2 and 3? For example, this is now not a generate in python 2. We should just be able to vendorize the couple functions we need here.