Allow combine on observable lists with immutable data & enhance combine performance#7

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mhoff wants to merge 3 commits intoTomasMikula:masterfrom

Commits on Mar 4, 2016

Rename ListCombinationBinding to ObservablesListCombinationBinding
Michael Hoff
committed
Reintegrate ListCombinationBinding using non-observable elements.
Michael Hoff
committed
Invalidate combined lists only once per change set.
Michael Hoff
committed