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

build/tasks/enqueue_ver.js

@@ -0,0 +1,42 @@
+/**
+ * Task: enqueue_ver
+ * Description: Set the versions in scripts.php for CSS/JS
+ */
+
+module.exports = function(grunt) {
+  'use strict';
+
+  var fs = require('fs');
+  var path = require('path');
+  var crypto = require('crypto');
+
+  grunt.registerTask('enqueue_ver', 'Set the versions in scripts.php for CSS/JS', function() {
+    var scriptsPhp = 'lib/scripts.php';
+
+    // Hash the CSS
+    var hashCss = grunt.helper('md5', 'assets/css/main.min.css');
+
+    // Hash the JS
+    var hashJs = grunt.helper('md5', 'assets/js/scripts.min.js');
+
+    // Update scripts.php to reference the new versions
+    var regexCss = /(wp_enqueue_style\('roots_main',(\s*[^,]+,){2})\s*[^\)]+\);/;
+    var regexJs = /(wp_register_script\('roots_scripts',(\s*[^,]+,){2})\s*[^,]+,\s*([^\)]+)\);/;
+
+    var content = grunt.file.read(scriptsPhp);
+    content = content.replace(regexCss, "\$1 '" + hashCss + "');");
+    content = content.replace(regexJs, "\$1 '" + hashJs + "', " + "\$3);");
+    grunt.file.write(scriptsPhp, content);
+    grunt.log.writeln('"' + scriptsPhp + '" updated with new CSS/JS versions.');
+  });
+
+  /**
+   * The 'md5' helper is a basic wrapper around crypto.createHash
+   */
+  grunt.registerHelper('md5', function(filepath) {
+    var hash = crypto.createHash('md5');
+    hash.update(fs.readFileSync(filepath));
+    grunt.log.write('Versioning ' + filepath + '...').ok();
+    return hash.digest('hex');
+  });
+};