added prd and stg nodes and projects to vagrant config.
add installation of mtl to node bootstrap.
add mtl export collection to mtl-bootstrap after command executes.
add guitars subdomain to mtl nodes.
regenerate job definitions after tweeks
refactor aclpolicies into separate files by role.
refactor mtl to be more robust in set -u environments.

Also refactored mtl to store attribute data inside the .mtl
subdirectory.
makefile to run make on plugins
trivial temote node step plugin demonstrating calls to mtl.
update readme with node and job changes