Update antlr to version 4.1

Update antlr to the latest release.  Also adjust the Matlab Grammar to continue
working.  No functional change necessary.

git-svn-id: https://groke.mcmaster.ca/svn/grad/colin/branches/TableTool_javization@10721 57e6efec-57d4-0310-aeb1-a6c144bb1a8b