Add nightlies script and cron.
Trim old nightlies to specified number of nightlies.

Fixes #81
Add import
Switch to auto index.
Merge branch 'master' of https://github.com/DMDirc/Infrastructure into nightlies

Conflicts:
	ansible/roles/nightliessite/tasks/main.yml
Merge pull request #85 from greboid/nightlies

Add basic nightlies site.