Bumps

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* Added partial support for parameter serialization

See [release notes](https://github.com/bumps/bumps/tree/v0.7.11#release-notes) for complete history.

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* restructure parameter table in gui

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* full support for python 3 in wx GUI
* allow added or missing parameters in reloaded .par file
* add dream state to return from fit() call

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* merge in amdahl branch for improved performance
* update plot so that the displayed "chisq" is consistent with nllf
* slight modification to the DREAM DE crossover ratio so that no crossover
weight ever goes to zero.
* par.dev(std) now uses the initial value of the parameter as the center of the
distribution for a gaussian prior on par, as stated in the documentation. In
older releases it was incorrectly defaulting to mean=0 if the mean was
not specified.
* save parameters and uncertainties as JSON as well as text
* convert discrete variables to integer prior to computing DREAM statistics
* allow relative imports from model files
* support latest numpy/matplotlib stack
* initial support for wxPhoenix/python 4 GUI (fit ranges can't yet be set)

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* add --view option to command line which gets propagated to the model plotter
* add support for probability p(x) for vector x using VectorPDF(f,x0)
* rename DirectPDF to DirectProblem, and allow it to run in GUI
* data reader supports multi-part files, with parts separated by blank lines
* add gaussian mixture and laplace examples
* bug fix: plots were failing if model name contains a '.'
* miscellaneous code cleanup

Release notes: https://github.com/bumps/bumps

Documentation: http://bumps.readthedocs.org