AUI-989 Add baseline tests.
AUI-989 Add tests for getNodeById() , childrenLength, removeChild(), isRegistered()
AUI-989 Add check to prime the index. isRegistered() is failing because the index has not been built.
AUI-989 Add tests for appendChild() and isRegistered() to check Parent TreeNode index.
AUI-989 Add missing registerNode() for Parent TreeNode.
AUI-989 Source formatting.
AUI-989 - Source formatting
Merge branch 'master' into pull-request-221-AUI-989