Python / pip, how do I install a specific version of a git repository from github (what is the correct url)?

Question

I want to install Django 1.7 via pip. It is currently a development version, so not in pips repositories.

So I have installed packages from github before using:

pip install git+[url here]

Now looking at github, I get the clone url on the django page:

https://github.com/django/django.git

But this mentions nothing of the branch. How do I specify that I want version 1.7? Is it somewhere obvious on the github page?