Also:
- New schema version 8 with video/image thumbnails, screenshots, sizes
- Upgrade messages not at current schema version when loading messages
to show in conversation
- New MessageDetail react component
- New ConversationHeader react component
Split out test-specific and general utility react components too.
And moved our test/legacy* files for the Style Guide into a styleguide/
subdirectory of test/.
I think we'll be able to live in this directory structure for a while.
Due to a number of hacks, the style guide can be used to show Backbone
views. This will allow a smooth path from the old way of doing things to
the new.