Filled in some missing javadoc
The beginnings of a selenium test suite for uberfire-workbench-client

Already found and fixed a bug! The SimpleWorkbenchPanelView was not delivering an
onResize() to newly added components.
Fixed UF-141: header and footer areas take up 20px of space even when empty

As part of the testing for this, I enabled bean activation checking on Header and Footer
beans. Now you can selectively hide headers and footers using Errai bean activation.