Sep 29, 2016 (0.2.3.1)
1. Change
  * Add a function for plotting individual parameters (plotInd) 

Sat July 16 2016 (0.2.3)
1. Change
  * Add a new task: the Ultimatum Game
  * Add new models for the Probabilistic Reversal Learning and Risk Aversion tasks
  * ‘bandit2arm’ -> change its name to ‘bandit2arm_delta’. Now all model names are in the same format (i.e., TASK_MODEL).
  * Users can extract model-based regressors from gng_m* models
  * Include the option of customizing control parameters (adapt_delta, max_treedepth, stepsize)
  * ‘plotHDI’ function -> add ‘fontSize’ argument & change the color of histogram

Sat Apr 02 2016 (0.2.1)
1. Bug fixes 
  * All models: Fix errors when indPars=“mode”
  * ra_prospect model: Add description for column names of a data (*.txt) file
2. Change
  * Change standard deviations of ‘b’ and ‘pi’ priors in gng_* models	  

Fri Mar 25 2016 (0.2.0)
Initially released. 
