updating style to the one used for my collecting behavioral data online course
some new images
everything up to part 4, merged in slides from Josh's deck so there is just one presentation to juggle
clarifying what javascript is before jspsych is introduced
some updates to the "about psiturk" section
added link to marvit article
about the psiturk cloud, etc...
Merge remote-tracking branch 'origin/cogsci2014'