Validate user login.
Merge branch 'develop' of https://github.com/nguyenconghoang/lily into develop

Conflicts:
	src/app/index.html
Update user login validation.
Store current user login into sessionStorage.
Refactoring app: div app to multi modules
Added signup form.
Merge branch 'develop' of https://github.com/nguyenconghoang/lily into develop

Conflicts:
	src/app/index.html
Update bower json
Fixed bug login/sign modal with tabs.
Update sass file
Update sass file
Done Sign Up new user feature.
Fixed bug reload page when switch between login and sign up tabs.
Remove unneccessary parameter on login and sign up function.
Show, hide notifications and offers (apply animation)
Remove un-necessary style
Fix animate on sidebar
Changed effect of animation on sidebar.
Apply ui-router, split home page to multi section
Implement redeem product and expert review