Read master into demo/ subtree
clear out unneeded stuff from master
jekyll and git ignores
fix _config
unignores
track demo datafiles
project page
port in fuller model info field
about_view tweaks [cherry-picked from master]

no "About this model" heading enforced; use free-form html in info.json
model_info field instead.

coloring for links in about_view by default

fix bug where "loading" well wasn't hidden by /about if it was loaded
first
tweaks to tech notes
preventDefault on word form submit

This fixes a weirdness in Chrome and Safari, where submitting the form
automatically sticks a ? in the URL.
elaborations of the project page