Support memoryviews

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Let's see what travis says.

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Looks like this has the added benefit of being able to compress (unicode) strings in Py3. 👍

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This still needs quite a lot of work, but should be doable in principle, the code is a proof-of concept.

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Okay, this one is pretty much ready now. Some notes:

I had to disable Travis-CI for Python 3.2 since it raises Syntax errors on unicode literals.

On Python 2.x we support unicode, on 3.x we don't. This mimics exactly how the zlib module works and actually required some Python version checking in the C module source-code. Not that nice, I know but it works.

Return type is always bytes, like zlib.

For now, it only support compression of bytes-like objects with buffer interface, decompression to be added as a separate pull-request.

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Not enough maintainers, will merge this by myself.