Release v1.2.1

Changelog

9c81426 release 1.2.1
693c011 breadth first tree walking
f5996b9 keeping a cache of nodes to improve toRoot speed
49e8414 Selection is working, clean up test app a bit.
9c52250 Node to toplevel class
02eab8c detect changes
5f3d073 introduced Node class for tree
896c899 trying to figure uit the STree rendering issue
8adce12 use the propertyName in the toString
d51e775 removed debug info from layout
047f85e refactored some event methods
f2a0cc9 small refactoring while hunting for the event issue
fe65c3b start using miglayout for V and H panel
dae8a87 added bean monitor