Log Message:
Update to 0.3; bug fixes.

release 0.3 (20130616)
   - Don't eval the control expression of the first #if of a block when
     already in a false block; it might not be valid. Reported by
     Baptiste Daroussin.
   - Don't recognize comments within character constants.
   - Don't recognize macro argument parentheses or commas within strings,
     or within character constants either.