Login and logout integrated into main app

- integration of login
- integration of logout
- added new bower dependency angular-cookies
- minor design changes
Main menu

- new layout
- fix css of main menu
- show/hide main menu - add/remove class active for .sidebar element (look on partials/main-menu.html)
Check of permissions on every route

Permissions can be defined for every route now.
Change Password integrated into main page

Merged Change Password functionality.