Fold .ufo as well as glyphs dirs in filestree()

This is broken and toggles the parent. .ufo as well as the glyphs dir,
when only the glyphs dir should be toggled.
Merge branch 'master' into folded-ufos
Merge branch 'master' into folded-ufos
Use jQ stopPropagation() to fix folding

Also make the initially hidden branches of the tree hidden in the site
CSS instead of hide() calls
Merge branch 'folded-ufos'