python-grip isn't usable in python

Steps to reproduce:
- fix gir1.2-grip in python as per the workaround in the other bug (bug 861596)
- ensure python-grip is installed from oneiric
- start python and type 'from gi.repository import Grip'
>>> from gi.repository import Grip
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/gi/importer.py", line 76, in load_module
    dynamic_module._load()
  File "/usr/lib/python2.7/dist-packages/gi/module.py", line 224, in _load
    overrides_modules = __import__('gi.overrides', fromlist=[self._namespace])
  File "/usr/lib/python2.7/dist-packages/gi/overrides/Grip.py", line 29, in <module>
    Grip = modules['Grip'].introspection_module
  File "/usr/lib/python2.7/dist-packages/gi/module.py", line 243, in __getattr__
    return getattr(self._introspection_module, name)
  File "/usr/lib/python2.7/dist-packages/gi/module.py", line 105, in __getattr__
    self.__name__, name))
AttributeError: 'gi.repository.Grip' object has no attribute 'introspection_module'

Workaround:
change 'Grip = modules['Grip'].introspection_module ' to 'Grip = modules['Grip']._introspection_module' in the source code at bindings/python/Grip.py