add vectorisation option and some emcee compatibility

[JohannesBuchner]

Hi @minaskar,

Great work here! Thanks for creating zeus.

I am attaching a pull request that gives some emcee compatiblity, making it easier to use the samplers interchangably.

Some changes:

• store log probability in samples, so they can be retrieved later
• add some functions supported by emcee to allow interchangable runs
• make samples axis order consistent with emcee

I just saw that this also addresses issue #1.

I hope these changes are of interest to you.

Cheers,
Johannes

[minaskar]

Hi Johannes,

I just pushed a new update partially based on your insights, with only some minor differences (e.g. see the vectorise implementation).

Thanks a lot for your contributions!! If you have any other suggestions, feel free to submit another pull request.

Great work,
Minas

[JohannesBuchner]

Ah, that's quite the elegant solution for the vectorize parameter :)