Small optimizations#64

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tgbrooks wants to merge 4 commits intomainfrom

small-optimizations

Commits on Jul 23, 2012

optimize intersect_bounds
Thomas Brooks
committed
short-circuit some layout_needed tests
Thomas Brooks
committed
cache outer_position and outer_bounds
Thomas Brooks
committed

Commits on Jul 25, 2012

actually use the optimized intersect_bounds
Thomas Brooks
committed