Fix 1215 - fix double nonworking expando#1232

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edhager wants to merge 3 commits intodojo:masterfrom edhager:1215-double-expando

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Commits on Jan 6, 2016

Fix 1215: Tree: Avoid repeatedly registering expand event handlers

edhager
authored and
Kenneth G. Franqueiro
committed
Fix issue with expand rows' children not being indented properly when using the Tree mixin with the ColumnSet mixin.
edhager
committed
Use new rowExpand in the tree test and remove unneeded module dependencies.
edhager
committed