Add two Temporal Memory implementations

[mrcslws]

These are ported from htmresearch and updated for Python 3.

When this change is combined with https://github.com/numenta/nupic.research.core/pull/1, the TM unit tests pass.

Most of the commits in this PR come from preserving the change history. The actual new code here is just the final few commits.

[lscheinkman]

Because this code depends on nupic.research.core it would be better make it an optional installable package (https://github.com/numenta/nupic.research/tree/master/packages) instead of part of the core code. Could you create a separate optional package for this code? You can also move the unit tests to the package

[lscheinkman]

👍 LGTM Thanks,

Nice trick customizing flake8 per package. I didn't know that was possible