Update version number
Add method to move elements within the tree
Add scrolling to the tree view
Can now change String representation of Element

The return value of Element#toString() can be changed to the value of an
attribute of the element.
Changing element's tag resets its representation

The toString() representation of an element resets to the value of its
tag when the tag is changed.
Add stub version of element representation changer
Add RepresentationType enum
Add license premable to Representation views
Finish the representation view
Move RepresentationView into view package
Add license text to RepresentationView
Add beginnings of RepresentationController
Update the ChangeLog
Can now change representation of Elements