config Grunt to use Require to output mini/concat site js file (see msg)

-install grunt-contrib-requirejs and update package.json
-add to requirej task to Gruntfile.js...builds out js/main.min.js for the site
-update js/jsBuild.js but hide it from .gitignore (this may get undone someday)
-add jsBuildOut directory: contains files that output js/main.min.js via r.js
-move/rename js source files from js/ to jsBuildOut.
-link main.min.js to all site pages via Jekyll layouts
-update site notes.