refs #14360. various small clean ups to demo + add some images.
refs #14360. various small clean ups to demo + add some images.

git-svn-id: 122c161429ab1c20a1ace62e4e7198a0c17d5838@27218 560b804f-0ae3-0310-86f3-f6aa0a117693

ibm-js/dtreemap,ibm-js/dtreemap