Merge branch 'release/0.1.7' into live
Merge tag '0.1.7'

release 0.1.7
replace username regex to fix #19

- change username regex in caffeine.urls to match username syntax in
  django.contrib.auth.models.AbstractUser
Merge branch 'release/0.1.8' into live
Merge tag '0.1.8'

release 0.1.8
Add tests to reproduce #22 and check correct validation

- caffeine.tests.test_forms: test behavior of form validation
- caffeine_api_v1.tests.test_views: test behavior of API calls
limit date filter to time window to fix #22
Merge branch 'release/0.1.9' into live
Merge tag '0.1.9'

release 0.1.9