Add search menu item (non-functional)
Update gitignore for Eclipse
Element text area scrolls now
Make the New Root frame larger
Add a check-for-null in mousePressed()
Add ElementEvent class

This class will be used to determine what happened to the Element tree
when it changes.
Add Object param to Observer/Observable notification
Update Element to send event type to observers
ElementTreeModel takes event type into account
GenericObservable passes object on notify
Add documentation to ElementTreeData class
Adding children does not collapse tree