Node deletion indicator

[aaronlidman]

Via Eric on the mailing-list. On hover, much like iD does for things, just for delete.

[aaronlidman]

Been trying this out, a bit of a problem because hovering on a node has two possible actions: moving the node or clicking and deleting the node. Probably not going to indicate deletion as much as make some kind of tutorial/guide for informing users about that possibility.