Migrate mr-deploy-daemon to an upstart job.

Summary:
Migration Plan:
sudo /etc/init.d/mr-deploy-daemon stop
sudo update-rc.d -f mr-deploy-daemon remove
sudo rm /etc/init.d/mr-deploy-daemon
cd ~/aws-config
git pull
cd ~
sudo cp -afv ~/aws-config/continuous-integration/etc/init/mr-deploy-daemon /etc/init
sudo start mr-deploy-daemon

Test Plan: well, it worked for exercise-screens-daemon...

Reviewers: alpert, csilvers

Reviewed By: csilvers

Differential Revision: http://phabricator.khanacademy.org/D2058