Ran 'optipng -strip all' on all png files.
Run 'gifsicle --batch -O' on all gif files.
Minified bootstrap_plugins/alert_2.3.2.js.
Add Respondus 4.0 module.
Ran this command:
  wget https://www.respondus.com/downloads/Moodle-respondusws-v271-01.zip && unzip Moodle-respondusws-v271-01.zip -d mod/ && rm Moodle-respondusws-v271-01.zip
Merge branch 'mod-respondusws' into UCSFCLE_26_STABLE