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/app.less

@@ -0,0 +1,95 @@
+/*!
+ * Roots 6.1.0
+ */
+
+@import "bootstrap/variables.less";
+@import "bootstrap/mixins.less";
+@import "bootstrap/responsive-utilities.less";
+@import "bootstrap/utilities.less";
+
+/* ==========================================================================
+   Base
+   ========================================================================== */
+
+body { }
+
+
+
+/* =============================================================================
+   Header
+   ========================================================================== */
+
+#banner { }
+
+/* Fixed Topbar Navigation */
+body.top-navbar { padding-top: 60px; }
+body.admin-bar .navbar-fixed-top { top: 28px; }
+
+
+
+/* ==========================================================================
+   Content
+   ========================================================================== */
+
+#content { }
+
+
+
+/* ==========================================================================
+   Primary Content
+   ========================================================================== */
+
+#main { }
+
+
+
+/* ==========================================================================
+   Sidebar
+   ========================================================================== */
+
+#sidebar { }
+
+
+
+/* ==========================================================================
+   Posts
+   ========================================================================== */
+
+.hentry header { }
+.hentry time { }
+.hentry p.byline { }
+.hentry .entry-content { }
+.hentry footer { }
+
+
+
+/* ==========================================================================
+   Footer
+   ========================================================================== */
+
+#content-info { }
+
+
+
+/* ==========================================================================
+   WordPress Generated Classes
+   See: http://codex.wordpress.org/CSS#WordPress_Generated_Classes
+   ========================================================================== */
+
+.aligncenter { display: block; margin: 0 auto; }
+.alignleft { float: left; }
+.alignright { float: right; }
+figure.alignnone { margin-left: 0; margin-right: 0; }
+
+
+
+/* ==========================================================================
+   Media Queries
+   ========================================================================== */
+
+@media (max-width: 979px) {
+  /* Fix top padding when using the responsive grid with the fixed topbar */
+  body.top-navbar {
+    padding-top: 0;
+  }
+}