Pyodeint

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- Changed development status from alpha to beta.
- Jacobian callback has a new signature (fy=None, never passed by odeint, but by other integrators)
- Refactored wrappers, added "wall_time" entry in info-dict from integration.
- Refactored to use AnyODE base class (share code with pycvodes & pygslodeiv2)

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- Fixes to setup.py and conda recipe

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- Changes to info dict: rename 'nrhs' -> 'nfev', 'njac' -> 'njev', added 'cpu_time', 'success'

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- New function signature: integrate_predefined and integrate_adaptive now
also return an info dict containing ``nrhs`` and ``njac`` conatining
number of calls to each function made during last integration.
- Expose ``_odeint_numpy.steppers`` tuple at module level.
- check_callbable and check_indexing kwargs now defaults to False

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- Ship tests with package (e.g.: python -m pytest --pyargs pyodeint)

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- Less strict callback checks on python side.