scanner: Fix optparse on early 2.6 (#302)

mopidy/scanner.py

@@ -79,12 +79,15 @@ def main():
 def parse_options():
     parser = optparse.OptionParser(
         version='Mopidy %s' % versioning.get_version())
+    # NOTE Python 2.6: To support Python versions < 2.6.2rc1 we must use
+    # bytestrings for the first argument to ``add_option``
+    # See https://github.com/mopidy/mopidy/issues/302 for details
     parser.add_option(
-        '-q', '--quiet',
+        b'-q', '--quiet',
         action='store_const', const=0, dest='verbosity_level',
         help='less output (warning level)')
     parser.add_option(
-        '-v', '--verbose',
+        b'-v', '--verbose',
         action='count', default=1, dest='verbosity_level',
         help='more output (debug level)')
     return parser.parse_args(args=mopidy_args)[0]