Changed name of folder DataProviders to Providers.
Changed name of folder RemoteDataProviders to RemoteProviders.
Added class AutorizationProvider.
Added methods to class AutorizationProvider:
	+ (void) logInWithLogin:(NSString*)login password:(NSString*)password block:(void (^)(EnumUserRole, NSError*))callback;
	+ (void) logOutWithBlock:(void (^)(EnumUserRole, NSError*))callback;
Deleted methods from class UserRole:
	+ (void) logInWithLogin:(NSString*)login password:(NSString*)password block:(void (^)(EnumUserRole, NSError*))callback;
	+ (void) logOutWithBlock:(void (^)(EnumUserRole, NSError*))callback;
Added method to class UserRole:
	+ (void) setUserRole: (EnumUserRole)userRole;