implement get_image in new camera module

phytopi/camera/camera.py

@@ -6,6 +6,7 @@ import subprocess
 import signal
 
 from enum import Enum
+from PIL import Image
 from phytopi import db, models, app
 
 class CameraActionError(Exception):
@@ -68,4 +69,9 @@ class CameraWorker(object):
             self.status == CameraStatus.IDLE
         else:
             raise CameraActionError('Camera neither idle nor in timelapse mode!')
+
+    def get_frame(self, thumbnail=False):
+        img = Image.open('/dev/shm/mjpeg/cam.jpg')
+        return img
+