org.xhtmlrenderer.swing.RootPanel implements Scrollable which specifies the viewport resize rules.
This gets rid of some layout hacks, removes unsightly scrollbar flicker when resizing the viewport (especially noticeable when scrollbar policy is set to 'AS_NEEDED'), and may prevent some unnecessary revalidates/repaints.
Removed Java 1.7 library requirements.
Merge pull request #62 from tobymckoi/mainlineupdates

Implement Scrollable interface for viewport resize rules in Swing RootPanel.