Link typo (rapidsms-generic)
Update tox to run tests against latest django 1.4, 1.5, and 1.6
Be sure that a blank SMS message doesn't cause an error
Updates for django deprecations
Check for '', None, or nonexistent key
Organized imports
Merge pull request #422 from vkurup/feature/accept-blank-incoming-msgs

Feature/accept blank incoming msgs
Release 0.16.0
Merge branch 'release/0.16.0'
Merge branch 'release/0.16.0' into develop
Next release will be 0.17.0
Merge pull request #420 from jthurner/patch-1

Link typo (docs / rapidsms-generic)
Merge branch 'master' of github.com:rapidsms/rapidsms into develop
Merge branch 'develop' of github.com:rapidsms/rapidsms into develop
Allow international notation for originating number