Add admin for 'apps'
Add django.contrib.messages to settings
Minor model changes

- PEP8 compatibility
- Adding __unicode__ methods
Handle media uploads
Add prototype UI
Add script for importing data from apps.hel.fi
Make models python_2_unicode_compatible
Make proto_ui view names more descriptive
Add translation to available platform name
Model changes

- Add Category model
- Add the following fields to Application:
  - publish_date
  - contact_email
  - support_link
- Make Application / Platform relationship an explicit m2m
- Reflect these changes in the import script and prototype UI
Add initial API for Applications and Platforms
Add missing beautifulsoup4 requirement
Show metadata for Applications' supported platforms
Show full url for Application images
Expose Category in API
Add read_only for Application's platforms in API
Translate translatable fields in API