v1.8.0

• Added acceptance rate display feature when calling chain statistics
• User can specify skip or maxpoints in pairwise correlation and chain panel plots in order to thin chain.
• User can request item definitions when calling chainstats.
• Resolved #51 by adding method to check if limits are incompatible. User is provided with more descriptive error message.
• Updated documentation for Bayesian components.
• Added saving routines to accomodate post-processing. A lighter version of the results dictionary is saved to json when log routines are used for chains. This should address #55.
• Option to return KDE objects when using plot_density_panel. User can then evaluate pdf directly. This should address #66.