Merge pull request #162 from eosrei/14.04-upgrade

14.04 upgrade
Upgrading to Django 1.7 and all other requirements to current versions. System broken.
Fixing AttributeError: can't set attribute due to readonly value.

Adding django.setup() https://docs.djangoproject.com/en/dev/releases/1.7/#standalone-scripts.

Replace admin with admin.apps.SimpleAdminConfig per docs.
Limiting library import scope to stop ImportError: cannot import name 'notifications' from 'roundware'.

Remove RWValidatedFileField and replace with default ValidatedFileField
Removing get_default_session() to make new Migrations work
Add support for vagrant-cachier to reduce VM rebuilding times
Replace South Migrations with Django 1.7 Migrations and adjust install/deploy scripts to work.