change style.css build targeting in Gruntfile.js
finish creatin <header> based styles for < IE8
complete <nav> style updates for <= IE8
replaced <main> tag with <div> tag

<main> tage needs to be properly shivved in with either Modernizr or html5shiv.  Modernizr doesn't work unless manually added (don't wanna do that).  html5shiv supports it in the source code, but is spotty.  <main> may come back.
more styles added to support <IE8
push production copy of styles.css to GitHub