added experimental face.rotation.gaze

Outputs.md

@@ -40,6 +40,12 @@ result = {
             pitch, // pitch is face move up/down, value of 0 means center
           }
         matrix: [] // flat array of [3,3] that can be directly used for GL matrix rotations such as in Three.js
+        gaze:
+        {
+          angle,    // direction of gaze in radians 
+                    // in range of right=0*pi up=1*pi/2 left=1*pi down=3*pi/2 which is 0 to 360 degrees
+          strength, // strength of a gaze at a direction of angle
+        },
       }
       tensor:      // if config.face.detector.return is set to true, detector will return
                    // a raw tensor containing cropped image of a face