Rename django_stormpaht to stormpath_django

This is more consistent seeing as the package on pypi
will be called stormpath-django it was confusing to have the
module named django_stormpath.
removed sample test file
change author email and project link
small setup.py tweak
remove sync module. not used.
bump stormpath dep
small backend refactoring

Added helper function for fetching application. This helps
us avoid trouble in the test suite. Other small cosmetic
changes
silence new test runner warnings

django 1.6+ changed the way tests are detected, this doesn't
affect us to excplicitly selecting the new test runner silences
these warnings.
add initial travis.yml
add initial test suite

we are using live tests
make sure groups get synces local->stormpath

when a Group model is saved, since we don't override the
model, we use a signal (pre_save) to first save the Group to
Stormpath and then proceed to save locally.
add one more test for groups