updated .gitignore to ignore 'hidden' folder of code
Updated bernbetaShPsy.R
	- fixed the error-throwing/catching, so it only prints the message about finding the code if it can't find the HDIofICDF.R script
	- changed code dependency to just expect that the HDIofICDF function is already loaded, instead of loading a script

Also added code used for the blog post on 2/16