New Features

The call-function plugin can now wait for asynchronous functions to execute a callback before continuing to the next trial. (#552).
The RDK plugin now accepts character codes for selecting keys (#564). Thanks @vrsivananda !
The content element will automatically scroll to the top on a new trial, which fixes some issues where long surveys were stuck at the bottom of the page on a new trial.
Default key behavior (like space causing the page to scroll) is now prevented when the key is expected as input for a plugin that uses getKeyboardResponse to capture input.

Bug Fixes

The Open Sans font now correctly imports in the stylesheet. Thanks @guydav !
In some cases the backwards button in the instructions plugin would not work properly. Thanks for reporting, @kushinm ! (#553)
In some cases, image preloading would fail because values of null, 0, or false would be added to the list of images to load. (#557).
A bug in the external-html plugin caused a keyboard event handler to persist when it should have been cleared. Thanks @tbrotherm !
Two minor bugs were resolved in the RDK plugin (#565). Thanks @vrsivananda !
The -slider-response plugins had the wrong parameter type for the labels parameter, causing issues in the GUI. (#571).
Automatically putting the focus on the jsPsych content div was failing due to targeting the wrong element. (#563).