Updating scripts
Updating README
Updating README
Adding support for snapping to a grid
Using React.Children.only
Improving comments
Updating README
Adding browserify support
Adding react to dependencies
Ensure event handlers are destroyed on unmount.

These can be left over if, for instance, the draggable item has a 'close' button which
closes on mousedown.
Merge pull request #4 from STRML/master

Ensure event handlers are destroyed on unmount.
Merging master