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/hero-unit.less

@@ -0,0 +1,24 @@
+//
+// Hero unit
+// --------------------------------------------------
+
+
+.hero-unit {
+  padding: 60px;
+  margin-bottom: 30px;
+  background-color: @heroUnitBackground;
+  .border-radius(6px);
+  h1 {
+    margin-bottom: 0;
+    font-size: 60px;
+    line-height: 1;
+    color: @heroUnitHeadingColor;
+    letter-spacing: -1px;
+  }
+  p {
+    font-size: 18px;
+    font-weight: 200;
+    line-height: @baseLineHeight * 1.5;
+    color: @heroUnitLeadColor;
+  }
+}