integration-tester: Use specific Django version
integration-tester: Use specific Django version

We should be moving towards using specific versions of npm packages
we depend on, to avoid needing to synchronize when we make breaking
changes. This commit sets the Django version to the latest commit
(we can't use version numbers until we start publishing these
repositories in npm).

LuiseV/quilt,kklin/quilt,NetSys/quilt,NetSys/quilt,quilt/quilt,kklin/kelda,NetSys/quilt,ejj/quilt-dev,LuiseV/quilt,kklin/quilt,LuiseV/quilt,quilt/quilt,kklin/kelda,kklin/quilt,kelda/kelda,quilt/quilt,kelda/kelda,LuiseV/quilt,kklin/quilt,ejj/quilt-dev,quilt/quilt,kelda/kelda,LuiseV/quilt,kklin/kelda,NetSys/quilt,NetSys/quilt,kelda/kelda,ejj/quilt-dev,kklin/kelda,ejj/quilt-dev