GetLibs.vbs update that now supports compiling the libs and selecting core or…

GetLibs.vbs update that now supports compiling the libs and selecting core or Mod_exosip libs.  Default behavior is still the same, still to do is removing all the libs from the solution file and adding in pre-build events to auto download and build the appropriate libs.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@75 d0543943-73ff-0310-b7d9-9358b9ac24b2