
Django 1.5 has a memory leak (as mentioned in the 1.5.1 release notes: https://www.djangoproject.com/weblog/2013/mar/28/django-151/ ) Bump django requirement to >= 1.5.1 to avoid blowing out memory on stacktach worker processes. Change-Id: If05e05f0c12083bbdc624f1be1461509b10f5011