Changed input param of class - RequestManager to method:
	+ (void) send: (NSURLRequest *)urlRequest responseBlock: (void (^)(NSHTTPURLResponse*, NSData*, NSError*))callback countOfAttempts: (int)countOfAttempts;
Changed input param of class - ServiceAgent to method:
	+ (void) send: (NSURLRequest *)request responseBlock: (void (^)(NSHTTPURLResponse*, NSData*, NSError*))callback;
Added class RemoteAuthorizationProvider for call remote server for authorization or log out and set state of current user role.
Added methods to class RemoteAuthorizationProvider:
	// this method do authorization
	+ (void) logInWithLogin: (NSString*)login
               password: (NSString*)password
          responseBlock: (void (^)(BOOL isAuthorizated, UserRole *userRole, NSError *error))callback;
	// this method do log out
	+ (void) logOutWithResponseBlock: (void (^)(UserRole *userRole, NSError *error))callback;