Grouped similar parts together in tree.yml

This makes it much easier for me to find my way around. :)
Merge remote-tracking branch 'origin/master' into cleanups

* origin/master:
  Added travis build-status indicator.
  *whistles innocently* Just fixing travis notifications.
  Have travis ping IRC when things break (or get better)
  Fix typo
  Change separatron cost to $7000

Conflicts:
	tree.yml
Merge pull request #20 from pjf/cleanups

Grouped similar parts together in tree.yml