Mot

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This version is significantly faster than previous versions when ran using a GPU.

Changed
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- Made the optimizers work better with the local reduction.
- Removed some non-ascii characters for compatibility.
- Bugfix to allow using more than one device.

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Changed
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- Changed the optimization routines such that they use local memory reduction when evaluating the model. This generally speeds up optimization by 2~5 times.
- Refactored the model interface such that it has the function get_objective_function, instead of objective per observation.
- Restructured the methods to follow more the layout of numpy and scipy.

Other
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- Removed get_nmr_parameters and get_nmr_problems from the model interface. This information is already implicit in the starting points.
- Removed the multi-step optimizer and the random restart optimizer.
- Removed NameFunctionTuple, adds parser for CL functions as a string.

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Changed
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- Replaced Grako for Tatsu, as Grako was no longer supported.
- Updated makefile to use twine for uploading to PyPi.
- Removed the Tatsu as a debian package and updated installation instructions.
- Removed six as dependency.

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Changed
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- Small enhancements to the function evaluator.

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Fixed
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- Fixed model proposal updating using the model. The parameter vector was not correctly reset if more than one parameter was updated.

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Added
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- Adds support for nested structures in the kernel input data.