Real user login form

[at15]

• [ ] check user input
• [ ] show hint
• [ ] add remember me button
• [ ] use mock service to simulate backend
• [ ] integrate with real spring backend
• [ ] * unit test and lint, using travis

[at15]

when move the code from user.login to user.login-form got a problem for submit, how to communicate between components, like the login form is submitted and got 200 from server, how can it tell its parent component to change route, I guess it's not a good idea to let the form change the route

the communication part is included in the following doc https://angular.io/docs/ts/latest/cookbook/component-communication.html

• Parent listens for child event ( one direction, just (click)), this one is simper and might be better for the login component. finished in 4a3169a012790309aa625785426dd8a2f71900a5
• Parent and children communicate via a service (use rxjs pub sub, like a event bus?)

[at15]

Also the layout is a problem, the login page is quite like a dialog page, and we may need to use login dialog for sudo mode and session expire.

layout problem is finished in 4197f9d7309d21930b646705939fa7e1c33a4703