changes to the core jspsych.js file will break some backwards
compatibility. script files are no longer loaded dynamically, due to
issues with using $.getScript on local installations. this revision
makes defining a list of plugins unnecessary; they are automatically
recognized based on the experiment structure.
changes to similarity plugin: display is now sequential.
adding storybook plugin: this is an ipad plugin, which displays a single
image and records the location of touch events.
