BUG: Update SlicerExecutionModel

$ git shortlog --no-merges  6956eb..46f3d89
Francois Budin (1):
      Update ModuleDescriptionParser.cxx

Matt McCormick (1):
      BUG: Find JsonCpp library with in a Visual Studio build tree.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23029 3bd1e089-480b-0410-8dfb-8563597acbee