Middleware now serves data through Flux.

- Client.js handles "master" connection
- Updated accounts-display with new keys
- Users view now attaches to a Flux store and updates when it changes
- removed test implementation from main webapp mount
- removed other EventEmitter package - forgot we can just use Node's :)
- Added Flux dispatcher and constants
- Added Users-specific stores, middleware interface, and action creators
- Removed dummy data

Split UsersView out of Users - too crowded.