#fix the grid
add placeholder images
use tooltips for the sorting menu
style: if browser is too small, don't make small grid
style: more comments & structure
add assemble boilerplate

from
<https://github.com/assemble/boilerplate-site/blob/96c4c226f8fd58bc81e64
70291954bbb10963336/Gruntfile.js>
site: also sort by 'semester'
assemble: config & prepare for generating
assemble: build with JSON data from mustache template