Fixing some argument bugs in pymc3.py.

The patch !293 (merged) introduced a bug which meant that a step_kwargs argument had to provided if there was a step argument, this patch fixes this by introducing an option if nuts_kwargs/step_kwargs is None:. It also allows the user to specify the draws argument in default_kwargs instead of the init (sorry for two patches!) @matthew-pitkin could you check if these are okay ?

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changed title from Fixing some argument bugs in pymc3.py. to WIP : Fixing some argument bugs in pymc3.py.

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• a4467c22 - fixing bug from mr - changing curemthod to curmethod

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Looks good to me now.

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changed title from WIP : Fixing some argument bugs in pymc3.py. to Fixing some argument bugs in pymc3.py.

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Here's a patch to this that fixes the initialisation of NUTS 0001-Fixes-to-PyMC3-autoinitialisation-of-NUTS-step-metho.patch

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• 1be08c59 - Fixes to PyMC3 autoinitialisation of NUTS step method

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mentioned in commit 1f724ae8