 - added resize handler shadow (resize handler to be converted to a shape soon).  - added a div for window-content.
 - added resize handler shadow (resize handler to be converted to a shape soon).
 - added a div for window-content.

philkeys/art,sebmarkbage/art,anutron/more-behaviors,philkeys/art,kamicane/art,sebmarkbage/art,ThomWright/art,anutron/art-widgets,cloudera/art,cloudera/behavior,Orangeness/art,ThomWright/art,digitarald/art,anutron/behavior,cloudera/more-behaviors,cloudera/art-widgets