Fix a Django deprecation warning
Use @develop tablib
Remove temporarily mysql-python from deps (can't build on Py3 and does
not seem needed)
Add test suite in setup.py
Switch from runtests shell script to Python module
Use static imports in tests
Tests now live in the tests submodule
Fix wrong check for subclass (fails if checking lambda)
_get_relationship_target_field was not returning the right value
Rewrote ModelDeclarativeMetaclass.__new__() to get rid of temp lists and
use generators (and a shared parse_field function)
Add coverage file

(for ref coverage is 743 statements,82 miss: 89% covered)