fixes #14
fixes #10
fixes #8
fixes #12
Improved logic of creation of group for contacts.
Improved comments.
Method getLocationOfUser moved from controller to service.
Simplified names of modules.
fixes #3
Updated names of packages.
Simplified name of class.
Improved work with SyncException.
Extracted class ContactsManager.
Used different name for 'sign in' process.
fixes #6
Updated information about services, according to latest changes.
Updated name of resource.
Updated name of layout file for 'Sign In' activity.
Minor improvements for Maven.
Replaced 'search' service with 'coworkers'.