JJB scripts do not handle meta project names

Our first meta namespaced project (oftextensions/circuitsw) was recently voted into incubation by the TSC. Unfortunately '/' is a special character for Jenkins because of directory namespacing and also for JJB for the same reason.

We need to either handle nested directories which inform the scripts what the meta namespace should be or a new META parameter in the project's .cfg file that informs the scripts to appropriately set ${meta}-${project} or ${meta}/${project} if needed (the second form should really only be needed for git checkout)