Whitespace and formatting cleanup.

* Removed trailing whitespace
* Line length < 80 where possible
* Honor conventions on number of blank lines
* Honor conventions about spaces around :, =

mediagoblin/submit/security.py

@@ -16,9 +16,9 @@
 
 from mimetypes import guess_type
 
-
 ALLOWED = ['image/jpeg', 'image/png', 'image/tiff', 'image/gif']
 
+
 def check_filetype(posted_file):
     if not guess_type(posted_file.filename)[0] in ALLOWED:
         return False