Use async spawn() by default.

src/utils/safe-spawn.js

@@ -0,0 +1,45 @@
+/**
+Safe spawn utility for HackMyResume / FluentCV.
+@module safe-spawn.js
+@license MIT. See LICENSE.md for details.
+*/
+
+
+
+(function() {
+
+
+
+  module.exports = function( cmd, args, isSync ) {
+
+    try {
+
+      var spawn = require('child_process')[ isSync? 'spawnSync' : 'spawn'];
+      var info = spawn( cmd, args );
+
+      if( !isSync ) {
+        info.on('error', function(err) {
+          throw {
+            cmd: 'wkhtmltopdf',
+            inner: err
+          };
+        });
+      }
+      else {
+        if( info.error ) {
+          throw {
+            cmd: 'wkhtmltopdf',
+            inner: info.error
+          };
+        }
+      }
+      
+    }
+    catch( ex ) {
+
+    }
+  };
+
+
+
+}());