Replace polyfill.io Promise with es6-promise

https://github.com/PeggApp/pegg/issues/20
Remove express deprecation warnings
Use localhost instead of 0.0.0.0 for dev

Seems like Augustin keeps reverting back to 
localhost
Rename AppRoutes to AppRouter

This makes it more obvious in AppStateStore
Clean up unused code
Replace calls to Parse.history with AppRouter

Parse.history should never be called directly