Bayespy

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* Enable keyword arguments when plotting via the inference engine

* Add initial support for logging

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* Add maximum likelihood node for the shape parameter of Gamma

* Fix Hinton diagrams for 1-D and 0-D Gaussians

* Fix autosave interval counter

* Fix bugs in constant nodes

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* Fix indexing bug in VB optimization (not VB-EM)

* Fix demos

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* Fix computation of probability density of Dirichlet nodes

* Use unit tests for all code snippets in docstrings and documentation

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* Change license to the MIT license

* Improve SumMultiply efficiency

* Hinton diagrams for gamma variables

* Possible to load only nodes from HDF5 results

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* Concatenate node added

* Unit tests for plotting fixed