Bugs in pcolormesh

Hi,

I've come across two bugs with pcolormesh, one relating to the MacOSX backend, and the other relating to the linewidth argument being ignored. I've submitted tickets:

https://sourceforge.net/tracker/?func=detail&aid=3034775&group_id=80706&atid=560720
https://sourceforge.net/tracker/?func=detail&aid=3034778&group_id=80706&atid=560720

Cheers,

Tom