Added tests

Based on django tests for 1.4, 1.5 and 1.6
Now running with django 1.6
empty files
Fix ERROR: test_get_key_columns introspection.tests.IntrospectionTests)

Code from Manfre
https://bitbucket.org/Manfre
Remove print statements updated readme
remove print statment
Merge pull request #37 from tax/master

Added working tests! Woot!