Add grunt.js build script

- Move Bootstrap LESS files into new subdirectory

- Change app.css to app.less, add @import's to utilize
Bootstrap variables and mixins

- Remove plugins.js and main.js

- Move Bootstrap JS plugins into new subdirectory

- Add new _main.js file with example DOM-based routing
script that works off the WordPress body_class

- lib/scripts.php has been updated to remove all extra
CSS and JS files and also places JavaScript in the footer

assets/css/less/bootstrap/responsive-utilities.less

@@ -0,0 +1,43 @@
+//
+// Responsive: Utility classes
+// --------------------------------------------------
+
+
+// Hide from screenreaders and browsers
+// Credit: HTML5 Boilerplate
+.hidden {
+  display: none;
+  visibility: hidden;
+}
+
+// Visibility utilities
+
+// For desktops
+.visible-phone     { display: none !important; }
+.visible-tablet    { display: none !important; }
+.hidden-phone      { }
+.hidden-tablet     { }
+.hidden-desktop    { display: none !important; }
+.visible-desktop   { display: inherit !important; }
+
+// Tablets & small desktops only
+@media (min-width: 768px) and (max-width: 979px) {
+  // Hide everything else
+  .hidden-desktop    { display: inherit !important; }
+  .visible-desktop   { display: none !important ; }
+  // Show
+  .visible-tablet    { display: inherit !important; }
+  // Hide
+  .hidden-tablet     { display: none !important; }
+}
+
+// Phones only
+@media (max-width: 767px) {
+  // Hide everything else
+  .hidden-desktop    { display: inherit !important; }
+  .visible-desktop   { display: none !important; }
+  // Show
+  .visible-phone     { display: inherit !important; } // Use inherit to restore previous behavior
+  // Hide
+  .hidden-phone      { display: none !important; }
+}