A path of project is added to the end of the sys.path with pytest-gae.
But if dev_appserver, it is added to the first of sys.path.
This situation becomes problems.
If want to import the `tests` module that is in `my gae project` directory, it is imported from `webob_0_9` directory:
<module 'tests' from 'google_appengine/lib/webob_0_9/tests/__init__.py'>
As well, if want to import the `test` module that is in `my gae project` directory, it is imported from `python2.7` directory:
<module 'test' from '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/test/__init__.py'>