Convert stylesheets to SASS, import via global.scss

Note: converted stylesheets are SASS in name only; lots of work to do
to get these into actual SASS.
menu.scss errors
Images optimized

From automated Grunt run; saved 0 B.
New Grunt-created stylesheets
Remove nullAlt.js from functions.php

Script is already being run in core.js
Update scripts to concat
Concat and minify js, then register and enqueue
Update concat task for hours scripts
Update ulgify task for hours scripts
Hours scripts concatenated and minified
Load single hours js on /hours page