* updated docs for registerTaskHandler
* updated docs for registerTaskHandler

google/cornerstoneWADOImageLoader,google/cornerstoneWADOImageLoader,cornerstonejs/cornerstoneWADOImageLoader,mikewolfd/cornerstoneWADOImageLoader,cornerstonejs/cornerstoneWADOImageLoader,cornerstonejs/cornerstoneWADOImageLoader,google/cornerstoneWADOImageLoader,chafey/cornerstoneWADOImageLoader,mikewolfd/cornerstoneWADOImageLoader,chafey/cornerstoneWADOImageLoader,mikewolfd/cornerstoneWADOImageLoader,chafey/cornerstoneWADOImageLoader