ARROW-362: Fix memory leak in zero-copy arrow to NumPy/pandas conversion#200

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wesm wants to merge 3 commits intoapache:masterfrom

Commits on Nov 3, 2016

ARROW-362: Remove redunant reference count
xhochy
committed

Commits on Nov 6, 2016

Be more careful about reference counts in zero-copy handoff, add pyarrow.Array.to_pandas method
wesm
committed

Commits on Nov 7, 2016

Force gc to avoid non-deterministic failure
wesm
committed