XServer Deploy tasks.
Setup apparmor for xserver.
Add a section for the xserver.
Add the xserver upstart script.
Move git install to common.
Correct version variable name.
Create a virtualenv for the python sandbox.
Update apparmor configurations.

Allow for the app armor configuration files to be loaded from secure repo if
available and loaded from the base configuration otherwise.
Update jinja templating.
Add nginx tasks to xserver.
Update nginx port configurations.
Add a task for installing xserver requirements.
Correct the pip install settings and add system packages needed by numpy.
Change the mode on the sandbox sudoers file.
Move xserver vars into a map.
Switch to dot notation instead of bracket notation.
Move back to prefix notation for xserver vars.
Add xserver env file and checkout the grader code.
Fix some overzealous renaming.
Pull in 6.00x using git ssh.