Broke SRP on Auth-class and added modify()-method,
Broke SRP on former RegisterForm to handle modification as well
currently UserInformationForm,
Modified MenuComponent,
Added MenuComponent to MainView,
Background to LoginView,
CSS to styles.css,
and other cockfuckery
set the check for empty user table. set first user as admin.
couldn't test if it works, though.
another commit
Merge remote-tracking branch 'esahal/master'

Conflicts:
	WebContent/VAADIN/themes/flybook/styles.css
	src/hlrv/flybook/LoginForm.java
	src/hlrv/flybook/MainView.java
	src/hlrv/flybook/RegisterForm.java
	src/hlrv/flybook/auth/Auth.java
	src/hlrv/flybook/managers/UserManager.java