Updated quick start project set up order

Setting up a Django project requires for Django to be installed. In the updated version of the quick start guide, first we create the directory, then creating the virtual environment , then installing Django and Django REST Framework. Finally we are able to create a new Django project and therefore an app. 

Before this pull request, unless you had Django installed globally, initializing the project using `django-admin.py startproject tutorial` was failing with the following error `-bash: django-admin.py: command not found`.