Fixed Struct extrusion and added Struct boundary function#41

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Rayzen wants to merge 2 commits intocvdlab:masterfrom

Commits on Sep 21, 2012

Fixed plasm.Struct.prototype.extrude function and added plasm.Struct.prototype.boundary function
Rayzen
committed
Optimized STRUCT function: doesn't clone models into temp array
Rayzen
committed