Include tests for conda packaging, fix bug in __array_ufunc__

Matthew Bryan requested to merge bryan/empyre:conda_packaging into master

Links to LiberTEM issue

Includes tests in the source tarball so that conda build can run them.

Also fixes a potential bug in array_ufunc:

Specifically when the out= kwarg to the ufunc was (None,) numpy was raising a TypeError. I've added a line which converts the single-entry (None,) to just None and now no problems (with the tests). [Mixed/mutil-array out= or single-array out will still remain as they are.]

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