data.addProperties in docs (fixes #178)
data.addProperties in docs (fixes #178)

jspsych/jsPsych,jspsych/jsPsych,shamrt/jsPsych,shamrt/jsPsych,jspsych/jsPsych,msrresearch/jsPsych,jodeleeuw/jsPsych,wolfgangwalther/jsPsych,jspsych/jsPsych,wolfgangwalther/jsPsych