Merge pull request #8 from Chris7/lowercaseReferral

make referral name from url case always lowercase
Merge pull request #7 from Chris7/master

check for referral existance before campaign check
increase version to 0.9.3
rename test files
some additions to gitignore
use settings.AUTH_USER_MODEL instead of get_user_model
pep8 fix
upgrade requirements
add test settings
remove old test runner
fix typo
update test make targets
move legacy migrations to south_migrations
add django 1.7 style migrations
remove requirements from setup.py
change license to MIT
add some classifiers to setup.py
Merge branch 'django1.7'
add test for UserReferrer repr
better exception test in UserReferrerTestCase