renamed drag events to avoid clashes with hammmer.js
renamed drag events to avoid clashes with hammmer.js

AbdulMuhsinSE/mapjs,danielrasmuson/mapjs,danielrasmuson/mapjs,AbdulMuhsinSE/mapjs,bhargav175/mapjs,danielrasmuson/mapjs,pyxis777/mapjs,AbdulMuhsinSE/mapjs,pyxis777/mapjs,pyxis777/mapjs,bhargav175/mapjs,bhargav175/mapjs,mindmup/mapjs,mindmup/mapjs