Embracing duck typing.

ImageProcessor didn't do anything. I'd rather get it out of there to reduce the
temptation for future IK contributors to do type checking and mess up peoples'
custom processors.

imagekit/processors.py

@@ -1,6 +1,6 @@
-""" Imagekit Image "ImageProcessors"
+"""Imagekit image processors.
 
-A processor accepts an image, does some stuff, and returns a new image.
+A processor accepts an image, does some stuff, and returns the result.
 Processors can do anything with the image you want, but their responsibilities
 should be limited to image manipulations--they should be completely decoupled
 from both the filesystem and the ORM.
@@ -9,12 +9,7 @@ from both the filesystem and the ORM.
 from imagekit.lib import *
 
 
-class ImageProcessor(object):
-    def process(self, img):
-        return img
-
-
-class ProcessorPipeline(ImageProcessor, list):
+class ProcessorPipeline(list):
     """A :class:`list` of other processors. This class allows any object that
     knows how to deal with a single processor to deal with a list of them.
     For example::
@@ -28,7 +23,7 @@ class ProcessorPipeline(ImageProcessor, list):
         return img
 
 
-class Adjust(ImageProcessor):
+class Adjust(object):
     """Performs color, brightness, contrast, and sharpness enhancements on the
     image. See :mod:`PIL.ImageEnhance` for more imformation.
 
@@ -68,7 +63,7 @@ class Adjust(ImageProcessor):
         return img
 
 
-class Reflection(ImageProcessor):
+class Reflection(object):
     """Creates an image with a reflection.
     
     """
@@ -111,7 +106,7 @@ class Reflection(ImageProcessor):
         return composite
 
 
-class _Resize(ImageProcessor):
+class _Resize(object):
     
     width = None
     height = None
@@ -234,7 +229,7 @@ class Fit(_Resize):
         return img
 
 
-class Transpose(ImageProcessor):
+class Transpose(object):
     """ Rotates or flips the image
 
     """