Whitespace cleanup

Added .dir-locals.el to tell emacs to automatically clean-up trailing
whitespace on save.

--HG--
extra : histedit_source : 5b45c779f44cf4b4a040dc656762e1b76344cc77%2Cbcc64c5bcf4d2f7698424ffe374d34d58e4ff65a

.dir-locals.el

@@ -0,0 +1,3 @@
+;; This tells Emacs to automatically run whitespace-cleanup when
+;; editing any file in the S3QL source tree.
+((nil . ((eval . (add-hook 'before-save-hook 'whitespace-cleanup nil t)))))

rst/backends.rst

@@ -19,7 +19,7 @@ options are documented with the respective backends below.
 
 All storage backends respect the :envvar:`!http_proxy` (for plain HTTP
 connections) and :envvar:`!https_proxy` (for SSL connections)
-environment variables. 
+environment variables.
 
 
 Google Storage

src/s3ql/adm.py

@@ -92,7 +92,7 @@ def main(args=None):
 
     if options.action == 'upgrade':
         return upgrade(options)
-    
+
     with get_backend(options) as backend:
         if options.action == 'passphrase':
             return change_passphrase(backend)

src/s3ql/common.py

@@ -538,7 +538,7 @@ def split_by_n(seq, n):
     while seq:
         yield seq[:n]
         seq = seq[n:]
-        
+
 def handle_on_return(fn):
     '''Provide fresh ExitStack instance in `on_return` argument'''
     @functools.wraps(fn)