MNT: Accept pathlib.Path, normalise to string for image cache keys. All other

eval routines should already be compatible

pyfeeds/imagecache.py

@@ -77,7 +77,7 @@ class ImageCache:
         returned value will be ``None``.
         """
 
-        imagefile = op.realpath(op.abspath(imagefile))
+        imagefile = str(op.realpath(op.abspath(imagefile)))
         image     = self.__images.get(imagefile, None)
 
         if image is not None:
@@ -108,7 +108,7 @@ class ImageCache:
         # it in this way because all keys
         # passed to __getitem__ get
         # transformed in the same way.
-        imagefile                    = op.realpath(op.abspath(imagefile))
+        imagefile                    = str(op.realpath(op.abspath(imagefile)))
         imagesize                    = size(image)
         self.__images[    imagefile] = image, data
         self.__imagesizes[imagefile] = imagesize