Added webkit-specific overflow scrolling for iOS devices to allow for inertial scrolling.
Merge pull request #382 from dzaikos/ios-inertial-scrolling

Enable inertial scrolling for iOS devices.
Merge branch 'master' into cache-image-size
Updated cache_images() to use _MIN_CACHE_IMAGE_SIZE constant when checking file size. New constant is defined upon including rssfuncs.php if not already defined.