Add notebook tutorial on pool-based sampling.

[dataframing]

Hi!

This PR addresses #9 and contributes a notebook-style example for pool-based sampling. I took a bit of liberty to add inline documentation along with references to the modAL documentation and other open resources. I also spent an embarrassing amount of time trying to parse the Matplotlib API. Fortunately, this is just an upfront cost and not recurring :)

Please let me know if there's anything under- or overly-communicated and I'll tune the documentation properly. If this is what we had in mind for notebook-style documentation, I'm happy to spend more time porting other examples.

Thanks!

[codecov-io]

Codecov Report

Merging #10 into dev will not change coverage. The diff coverage is n/a.

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  Misses         29       29

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[cosmic-cortex]

Thanks, awesome! Great work on the example. (I have only changed the filename in order to match the filename of the standalone example if you don't mind.)

I'll start working on adding some more examples, so let me know if you are working on something, to make sure we don't do twice the work :)

[dataframing]

No prob! I'll probably be focusing on that ranked batch-mode integration/feature (+ documentation, of course 😛), so I think it's safe to expand on the current documentation 👍