Vectorized comp_val och cred_mass in the mcmc_stats function
First version of the print function for bayes.prop.test
Implemented all s3 function for bayes.prop.test.
Fixed bug with calculating the limits for plot.bayes_prop_test
Renamed the test scripts
Added tests for bayes.prop.test
Small tweak to the bayes.prop.test plotting function.
Added documentation to bayes.prop.test