Revert "Update leaks unit test"

This reverts commit dbbc956c1c8fa28dd6d312fe8f9b77a66068a5b7.
Revert "Revert "Update leaks unit test""

This reverts commit 4ab8d8710ad052476c58291e2eb75b608c99f82b.
Revert "Use a memwatch version that can compile on node 0.11"

This reverts commit 1df2dafac39fa189161739d124e7b0c67d951eb5.