upgrade dependencies

* Django 1.6.2
* django-user-accounts 1.0c4
* django-forms-bootstrap 3.0.0
* Markdown 2.4
* celery 3.1.9
* billiard 3.3.0.16
* amqp 1.4.3
* django-redis-cache 0.11.1
upgrade ol3 to beta2