Updated README and wsgi.py

Just about done reading the two-scoops book. Great job! I've been recommending it to all of my colleagues. 
I found that your startproject command listed in the book was failing on the supplied github template. It turns out that I've been using virtualenv the "wrong" way for a few years.  I added a more specific reference to mkvirtualenv from virtualenvwrapper. Also, I couldn't get django-admin.py to recognize the settings modules without adding them to the path, so I supplied instructions for best practices to that effect. 

I'm not quite up to speed with django's new startproject templates, so I'm not quite sure how to make the environ variable in "wsgi.py" the same as the startproject <name> argument. The provided instructions should make it a little more clear for those who get stuck, though.

Again,
Great book.