Global Nav, Bug Fixes

- Added back:button event (declared in App.Global). Event fired when
the back button on the browser is hit
- Added 'settings' route and filler stuff, currently uses the 'add new
plant' content
- Added @evaughn 's global nav menu
- Moved log out button to global nag
- Log in -> cancel -> log in now fixed
- Errors are now correctly formatted on the splash screen
- Back button woes have been solved