Make all the mouse events work right
Make all the mouse events work right

Two parts here:
* Typo fixes to make sure the right elements or classes are being accessed
* Rebinding the event handlers (and also rewriting the export method) to work on the extended features, not on the DOM Elements or simple Features
BjornFJohansson/giraffe,addgene/giraffe,BjornFJohansson/giraffe,addgene/giraffe,UndeadBlow/giraffe,BjornFJohansson/giraffe,BjornFJohansson/giraffe,addgene/giraffe,UndeadBlow/giraffe,BjornFJohansson/giraffe,addgene/giraffe