PEP8 cleanups

apps/converter/exceptions.py

@@ -1,29 +1,29 @@
 class ConvertError(Exception):
-    '''
+    """
     Base exception for all coverter app exceptions
-    '''
+    """
     pass
 
 
 class UnknownFileFormat(ConvertError):
-    '''
+    """
     Raised when the converter backend can't understand a file
-    '''
+    """
     pass
 
 
 class IdentifyError(ConvertError):
-    '''
+    """
     Raised by the graphcismagick and imagemagics identify program
-    '''
+    """
     pass
 
 
 class UnkownConvertError(ConvertError):
-    '''
+    """
     Raised when an error is found but there is no disernible way to
     identify the kind of error
-    '''
+    """
     pass