Add offlineimap.utils to the list of our modules

Forgot to do it while was adding stacktrace support.

Signed-off-by: Eygene Ryabinkin <rea@codelabs.ru>

setup.py

@@ -57,7 +57,8 @@ setup(name = "offlineimap",
       author_email = offlineimap.__author_email__,
       url = offlineimap.__homepage__,
       packages = ['offlineimap', 'offlineimap.folder',
-                  'offlineimap.repository', 'offlineimap.ui'],
+                  'offlineimap.repository', 'offlineimap.ui',
+                  'offlineimap.utils'],
       scripts = ['bin/offlineimap'],
       license = offlineimap.__copyright__ + \
                 ", Licensed under the GPL version 2",