Version 0.3
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* Fix for default MCMC simulation size of 0, which threw confusing errors.

* Removed most plotting functions (the ones depending on ggplot2). The ggplot2
  dependency was more trouble that it was worth. biplot still works, however.

* Added a coef method, which returns posterior samples of the implied regression
  coefficients for conditional response distributions

* Bugfix for imputing missing data.
