models.Experiment: merged 'get_variant_for' and
'enroll_subject_as_variant' into 'get_or_create_enrollment'.
merged selected files for example project from dev branch
Merge branch 'master' of github.com:lookup/Splango
added sample template
splango.models.get_or_create_enrollment: missing assign to `variant` variable
models.Experiment: fixed get_random_variant; created some methods docstrings.
Merge branch 'master' into dev-weighted-experiments

Conflicts:
	splango/models.py