fix flask-pypy
django: support 1.5
django-stripped: Support Django 1.5
Install gevent for django-psycopg2-pool.
Use persistent connection.
django: Remove django-psycopg2-pool.

It is for gevent.
Use Django 1.6's persistent connection now.
Django: Use 1.6a1 to use persistent connection.
Add tornado-pypy-raw.