Fix order of middlewres

By default SessionMiddleware must be before CommonMiddleware
Install wpadmin from my repo
Temporary disable usage of cached template loader for profuction/staging
Revert "Temporary disable Appenlight monitoring"

This reverts commit 9e812fccddb0217657fdf6099ff8ff5ec5b6fb89.
Prepare for Django 1.7
Update to Django1.7
Update wsgi.py file

Use `get_wsgi_application` function instead of manually using 
`django.core.handlers.wsgi.WSGIHandler`.