Added missing dirs to vpath

Also allow PROVISIONER, PROVISIONER_VERSION, and BUILDER_TYPES to be specified on the command line (or in the environment)
Also set the default for PROVISIONER_VERSION to be latest, if PROVISIONER is not provisionerless
added local.mak to Makefile
Merge pull request #57 from rasa/fix-vdirs-and-makefile-vars

Added missing dirs to vpath