Release/v0.2.0

Lots of new stuff:

- Localized error messages
- Entity validations
- Image upload
- Componentization of repetitive code
- Order statistics (needs work)
- Backend and frontend tests (needs work)
- Load all JS files on demand
- Integrated maven lifecycle of html and core modules into parent's pom
- Codeship integration
- Heroku deployment
- Proper logging configuration
- Versioned API system /api/v1/
- HTML5 mode
- Java config