Merge branch 'release/0.3.0' into develop

* release/0.3.0:
  bump version
Switching to mongolab
Disable write access for guests
Reindex 100 articles at a time
Use sentry instead of exceptional
bump version
Merge branch 'release/0.3.1'

* release/0.3.1:
  bump version
  Use sentry instead of exceptional
  Reindex 100 articles at a time
  Disable write access for guests
  Switching to mongolab