Add .bmp support

[siemdejong]

Add bitmap (.bmp) support.

[siemdejong]

It would probably be better to try-except image loading with PIL instead of filename endings to be sure other image types are included as well:

# e.g. power.py]
try:
    # Get image
    image = myimage.MyImage.get_generic_image(path_in)

   # Image.load('/path/to/image") will raise an IOError if the image cannot be loaded.
   # img.verify() # Will raise an Exception if the image cannot be verified. Can be added at the end of `get_generic_image()`.
except IOError, Exception
   continue