Mot

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- Adds cubic polynomial root finding method for real roots.

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- Another small regression fix.

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- Small regression fix in the Array class, only applicable when using the ``offset_str`` argument.

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Added
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- Adds complex number support using the PyOpenCL complex numbers.

Other
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- Small fix to allow scalars in the Array class.

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Changed
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- Removed the mot_data_struct system and replaced it with a Struct KernelData object.
- Refactored the numerical hessian API.

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Changed
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- Updated lmmin to version 7.0 of http://apps.jcns.fz-juelich.de/doku/sc/lmfit.

Other
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- Removed redundant super arguments.
- Simplified the optimization API.