A few changes#2

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TimMensch wants to merge 4 commits intostevedonovan:masterfrom

TimMensch:master

Commits on Feb 8, 2013

Ignore two warnings.
Tim Mensch
committed
Add __len method to Java arrays.
Tim Mensch
committed
Defer finalization of Lua objects until someone in the Lua thread is creating a new object.
Tim Mensch
committed
Clean up and simplify implemenation of delete cache.
Tim Mensch
committed