PIVOT-956, first changes to add the skin (optional) ability to disable Transitions.
Add a first Demo working (RowEditorDemo); for documentation purposes, set this is variants (under tests) of the skin default and dark config files.

git-svn-id: https://svn.apache.org/repos/asf/pivot/trunk@1622238 13f79535-47bb-0310-9956-ffa450edef68