C-bowman/inference-tools: 0.5.2 release

Added new set of Jupyter notebook demos, which can be found in the /demos/ directory

Added a new function inference.plotting.hdi_plot for convenient plotting of highest-density intervals derived from a sample of model realisations.

All sampling classes in inference.mcmc now pass model parameters to the user-provided posterior function as a numpy.ndarray, and the documentation has been updated to reflect this.