Recurse on the parent classloader (fix axel22/scalameter#22)
Recurse on the parent classloader (fix axel22/scalameter#22)

When searching for URLClassLoader, try falling back (recursively) on the
parent classloader. This finds a classloader in the setup used by SBT
0.13.0, and it seems a sensible default heuristic in general.

kjanosz/scalameter,storm-enroute/scalameter,kjanosz/scalameter,storm-enroute/scalameter,kjanosz/scalameter,storm-enroute/scalameter,storm-enroute/scalameter