feat(config): allow LiveScript configuration files

Author: czchen

lib/cli.js

@@ -14,6 +14,14 @@ try {
   // Intentinally blank - ignore if coffee-script is not available.
 }
 
+// LiveScript is required here to enable config files written in LiveScript.
+// It's not directly used in this file, and not required.
+try {
+  require('LiveScript');
+} catch (e) {
+  // Intentionally blank - ignore if LiveScript is not available.
+}
+
 var util = require('util');
 var path = require('path');
 var fs = require('fs');