Add count_nonzero to numpypy

Merged Bitbucket Importer requested to merge bitbucket/merged-pr-76 into branch/default

Created originally on Bitbucket by redorlik (Anders Lehmann)

Was already merged in Bitbucket before import, marked as merged by the import user

I had a go at the function "count_nonzero" at Europython.

Thanks to the help of Armin, I even managed to make a jit test (and make it pass).

Thank you Armin

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