Flask-admin

- Codebase was migrated to Flask-Admin GitHub organization
- Automatically inject Flask-WTF CSRF token to internal Flask-Admin forms
- MapBox v4 support for GeoAlchemy
- Updated translations with help of CrowdIn
- Show warning if field was ignored in form rendering rules
- Simple AppEngine backend
- Optional support for Font Awesome in templates and menus
- Bug fixes

Mostly bug fix release. Highlights:
- Inline model editing on the list page
- FileAdmin refactoring and fixes
- FileUploadField and ImageUploadField will work with Required() validator
- Bug fixes