update git-remote-bzr with utf-8 support

fixes eg. git clone "bzr::lp:openpetraorg", which caused an exception before:
File "/usr/bin/git-remote-bzr", line 314, in export_branch
   print "M %s :%u %s" % f
  UnicodeEncodeError: 'ascii' codec can't encode character u'\xfc' in position 59: ordinal not in range(128)
f is: ('100644', 28670, u'webserver/Samples/UploadDemo/388px-Droste-H\xfclshoff_2.jpg')