Add initial set of resource classes with GET functionality
Remove reference to resources.Mapping
Add create and delete methods
Add basic update methods
Add example of basic CRUD usage
Reorganise to use an api class rather than a global connection
Update readme
Update API host url
Add tests for bigcommerce.api
Make package python3 compatible

* Remove relative imports
* Remove reference to urllib.urlencode
* Add python 3.3 to travis
Update setup.py (bump version to 0.10.1)