Blog User Interface

A Blog User Interface needs to be designed and implemented. This is the main ticket for that. Sub-tickets have this structure:

Blog Fragment in Navigation Drawer (#409 (closed))
- UI to Create a New Blog (#410 (closed))
  - UI for Writing Blog Posts (#411 (closed))
    - Save Blog Posts as Draft and Show List of Drafts (#420)
    - Research and Implement Rich Text Editor for Writing Blog Posts (#421)
  - UI for deleting blog Posts (#418 (closed))
    - Contextual Action Bar for deleting multiple Blogs (#419 (closed))
- UI for Listing All Subscribed Blogs (#414 (closed))
- UI for Viewing Blogs (#415 (closed))
  - Blog Post Activity (#428 (closed))
- Display posts from all blogs the user subscribes to in a single combined feed (#417 (closed))

Please note that this ticket is not about sharing blogs with others. This is handled by ticket #406 (closed).