add testing support for django 1.8
change import path of get_model for django 1.8
document support for django 1.8
dont allow django 1.7 to fail
dont test on python 3.4 because not supported on travis
Revert "dont allow django 1.7 to fail"

This reverts commit 7eed06e634d7af85ba8e1dededd9ba0d4ecb87f7.

Conflicts:
	.travis.yml
Merge pull request #16 from saulshanabrook/feature/django-1.8

Add Django 1.7 Support