Colmena needs to ship a mobile app

[beeman]

The idea is to ship a starter mobile app that connects to the api. Because the admin is written in Angular it makes most sense to pick Ionic for this.

Some things that need to be includes:

• support all the content types from the api
• support authentication
• allow switching between domains
• multi language support
• easy theming

While this sounds like a lot of functionality, we should try to make it a simple app, easy to extend and remove functionality