Add alwaysShowScrollbar option. When set to true, scrollbar will be visible always even when there is no content to scroll.
Do not call any callbacks on not existing scrollbar element
Merge pull request #103 from PuzzleFlow/master

Do not call any callbacks on not existing scrollbar element
Merge pull request #93 from albertsmuktupavels/master

Add alwaysShowScrollbar option.
Updated pointer events to comply with W3C specification.
Fixed callbacks calls on destroyed scrollbars (pull request #103).
New option parameter added: alwaysShowScrollbar (pull request #93).
Readme update
Create readme.md file.
Added bower.json
Updated bower.json