Add a dev-requirements file for easy development dep installation.

Review Request #7448 — Created June 24, 2015 and submitted — Latest diff uploaded

Information

Djblets
release-0.8.x
c305429...

Reviewers

The dev-requirement.txt file makes it easy to install all the
dependencies needed for Djblets with one command, with the versions we
require.

To install from this, simply run: pip install -r dev-requirements.txt

Installed our dependencies using this file.