added main page layout
main page changes

1. Separated header from main page
2. Signing changes
main page login changes

1. Added login controller
2. Added rendering condition for login layout block
3. Added layout block for user/organization logo
main page login changes

1. Added register new user link
main page login changes

Variable 'global' used in different parts of the app, so:
1. Moved variable 'global' to $rootScope
2. Rewritten module 'Global' to gather values from $rootScope also
3. Moved variable 'global' initialization and updating to module 'mean.system'
login and register page changes

1. Translation to ukrainian
login and register page changes

1. Added fetching user data after registration and storing it in $rootScope