Highlight node row when a node is hovered over.

[khennny]

Thank you for the library.Great work done.
This is based on actual users feedback,
Due to how close the delete icons are to one another, it is difficult and confusing to delete the right node.
You might want to consider implementing a feature that allows for styling the background of a node row when a user mouse hover the node.
A similar feature is yahoo mail list page below:

Thank you.