Fixed multiple warnings.#61

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jcbertin wants to merge 3 commits intorobbiehanson:masterfrom

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Commits on May 19, 2016

Fixed warnings about implicit conversion from nullable pointer to non-nullable pointer.
Jean-Charles BERTIN
committed
Fixed warnings about no explicit ownership when compiling with -Wexplicit-ownership-type.
Jean-Charles BERTIN
committed
Fixed warning about declaration shadowing a local variable when compiling with -Wshadow.
Jean-Charles BERTIN
committed