fixed some 'declaration shadows a local variable' warnings
Declare the mocha method to keep the compiler happy.
Declare the regionOf:destRect:userInfo: method - it was causing a warning in outputImage.
(NB is it possible that the warning was legitimate and that xregionOf or xxregionOf should have been used instead?)
Merge pull request #13 from BohemianCoding/warning-fixes

Some minor warning fixes