Add Poisson likelihood to core likelihood functions

This adds the Poisson likelihood into the core likelihood functions. This is mentioned in issues #148 (closed) (so if @paul.easter has already written this function elsewhere feel free to ignore/close this PR) and #157 (closed).

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• 53b11855 - likelihood.py: rename function to func in Poission likelihood

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• 3b9d00e6 - likelihood.py: update Poisson likelihood

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• 8b6bc3b3 - likelihood.py: fix install error

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• 8c52644e - likelihood.py: fix install error

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marked as a Work In Progress

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• dd4dda13 - radioactive_decay.py: add example using Poisson likelihood

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• d973efae - likelihood.py: some fixes to PoissonLikelihood
• bb818350 - radioactive_decay.py: complete example

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I've now added an example here.

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Thanks for contributing this. There seems to be some duplicate code with GaussianLikelihood. That does not need to be sorted out in this MR. I will eventually refactor this.

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