Development environment automation for virtualenvwrapper users

[Virtualenvwrapper](http://virtualenvwrapper.readthedocs.org/en/latest/) can help automate the development environment setup. Using virtualenv only creates and activates a virtual environment. Using virtualenvwrapper you can add hooks like postactivate and postdeactivate to the virtualenvironment

Following that I automated the required commands described in the requirements file so virtualenvwrapper users can work on the project with minimal setup effort