Added ability to skip items with disabledClass.  Useful when sorting over hidden/non-visible items.
Added disabledClass option to README.
added scrollX and scrollY options to give us finer grained control over scrolling
Fixed skipping over disabled elements when they are visible.
Merge pull request #1 from marcucio/patch-1

added scrollX and scrollY options to give us finer grained control over scrolling
Merge branch '2.0alpha' of https://github.com/poscar/nestedSortable.git into 2.0alpha