ordbetareg v0.8

v0.8 up on CRAN. new features:

• add plot_heiss function to examine how scale components change given levels of a factor
• add prior_manual option to allow for a complete over-ride of priors in the model
  (enables cutpoint modeling)
• add posterior_epred_ordbeta function to allow for predicting the different
  components of the scale (bottom, middle and top)
• update vignette with sections on power analysis and modeling cutpoints
• assorted bug fixes to multivariate/missing data modeling