added some functions, using baseobject click methods
added class methods to click and doubleclick for use outside of instance of class
removed delete target popup to use general popup WarningDialog
removed DeleteTargetPopup to use common warning dialog instead
added scrollbar and functionality
initial revision Scrollbar.rb
added validation to screen init
initial revision of WarningDialogPopup
extra guard for getting children
initial endurnace test case
Merge branch 'matt_branch'