mirt 0.2.0
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* parameter standard errors added for mirt() (1 factor only) and bfactor() models

* bfactor() values that are ommited are recoded to NA in summary and coef 
  for better viewing

* 'technical' added for confmirt function, allowing for various tweeks and 
  varying beta prior weights

* product relations added for confmirt.model(). Specified by enclosing in brackets
  and using an asterik 

* documentation fixes with roxygenize  
