Sparkly feathers

Reworked Twigs security!

Breaking changes:

• renamed Permissions to Authorizer (and PermissionsProvider to AuthorizerProvider accordingly) (http://hatchteam.github.io/twigs/docs/#/api/twigs.security.service:Authorizer)
• Authorizer api now streamlined: all methods are asynchronous and return promises
• hasRoles() and isAuthenticated() removed --> see hasPermission() and isLoggedIn()
• Adapted and refactored Menu and Menu Directive (http://hatchteam.github.io/twigs/docs/#/api/twigs.menu.directive:twgMenu)
• Adjusted and simplified Protected routes http://hatchteam.github.io/twigs/docs/#/api/twigs.protectedRoutes.provider:ProtectedRouteProvider

Fixes:

• twgMenu Directive has its own scope (@michaelschnyder)