Initial bare-bones implementation of decorator and custom errors.

First 'master' release of the package. Should be backwards-compatible with the [0.1.x version](https://pypi.python.org/pypi/Flask-Nicely) currently on PyPI, but cleans up the internals and adds additional functionality in the form of custom error payloads inspired by the [Flask API Error](http://flask.pocoo.org/docs/patterns/apierrors/) pattern.

Release needs:
-[ ] Refactored internals to use httplib for generic error messages
-[ ] Tox testing for Python 3.x compatibility
-[ ] Improved documentation - why should anyone use Flask-Nicely?
-[ ] Changelog

Should close #1 and #2.