When parsing Matlab code, make sure the parsed code always ends in a newline.

The grammar file requires Matlab expressions, it expects the expression to end
with a newline.  However, lots of generated code doesn't.  Thus force this to be
always correct.  Note that any extra newlines shouldn't cause issues.

git-svn-id: https://groke.mcmaster.ca/svn/grad/colin/branches/TableTool_javization@10661 57e6efec-57d4-0310-aeb1-a6c144bb1a8b