Refactor and advancements

- Drops mailController, centralized in UserController
- Adds views folder for change_password
- Improves PromiseRouter to support text results
- Improves PromiseRouter to support empty responses for redirects
- Adds options to AdaptableController
- UsersController gracefully fails when no adapter is set
- Refactors GlobalConfig into same style for Routers

spec/MockEmailAdapterWithOptions.js

@@ -4,6 +4,7 @@ module.exports = options => {
 	}
 	return {
 		sendVerificationEmail: () => Promise.resolve(),
+    sendPasswordResetEmail: () => Promise.resolve(),
     sendMail: () => Promise.resolve()
 	}
 }