Feature/install opentripplanner

I happen to be doing some Ansible work right now, so I'm trying out this pattern (as best I can since Veterans is old Ansible and doesn't use roles) and I like it so far. Following the host = machine pattern basically ignores Ansible inventory files, which results in multiplication (and duplication) of inventory / group_vars files on a per-host-type basis. Using the nyc-trees pattern collapses some of that duplication into fewer files but gives you roughly the same result, which I think is a good thing.