[PATCH] -include option and -exclude ignore arguments finishing with '/'

[Edwin Vane]

  It'd be interesting to see if `canonicalize()` would work here and for the case with '.' just above it. It may not even be necessary if `equivalent()` can handle '/' and '.' when testing against stored paths.

  Definitely tests are requried.

http://llvm-reviews.chandlerc.com/D1134