Merge pull request #15 from Danack/upstreamAddDefine

Added new function defines which were introduced in ImageMagick 6.5.2-8
Fix wrong type_spec in getPixelRegionIterator
Merge pull request #21 from watashi/master

Fix wrong type_spec in getPixelRegionIterator
Lets see if this fixes #22
Merge branch 'master' of github.com:mkoppanen/imagick
This should fix #22