Made volname be Mac OS X dependent.  OS X let's you get away with
passing any options to fuse and ignores the ones it doesn't
understand.  Linux is picky.  So right now to mount under Linux, you
have to get the options exactly right.  It appears Linux also doesn't
like an empty set of options, so adding -o foregound to your mount
command seems to be required.

Eventually this will be cleaned up.