Renamed IndexRoute to FeaturedRoute

* Also changed all the related code
* The IndexRoute is now an empty route
* The ApplicationRoute now transitions to FeaturedRoute after app start
Implemented custom app homepage. resolves #25

* Implemented SettingBarComponent
* Added settings bar to all routes displaying a list of streams
* WIP: multiple stream list layouts (buttons disabled for now)
* Properly aligned scrollbar thumb to buttons of settings bar