Revision 1885557

Follow up to r1884427: mailer.py: Additional fix for Python 3 support

* tools/hook-scripts/mailer/mailer.py
  ():
   - Don't import StringIO.
   - import locale for output class 'StandardOutput'.
  (main): Don't decode cmd_args[x], because they are already str.
  (OutputBase.write_binary): New method, as the abstract base class of
   output classes.
  (OutputBase.write): Tweak comment. This method has implementation now.
  (OutputBase.run): Use self.write_binary() to write content of buf.
  (StandardOutput.write): Override default write method to use default
   encoding for console output.
  (PropChange.generate): Use sys.stdin.buffer instead of sys.stdin to read
   from stdin as bytes.
  (Lock.__init__):
    - Use sys.stdin.buffer instead of sys.stdin to read from stdin as bytes.
    - Strip new line character from items of self.dirlist
  (DiffGenerator.__getitem__): Pass change.path as is to svn.fs.FileDiff.
  (TextCommitRenderer.render): Don't decode data.author. data.author is
   already bytes (or None) here.
  (Repository.__init__): Ensure self.author is str or None.
  ((entry routine)): Encode repository path as UTF-8 before canonicalize
   explicitly.

Review by: stsp