fix(spawnify) prevent options overwrite

Author: coderaiser

lib/spawnify.js

@@ -29,16 +29,16 @@
     module.exports = function(command, options) {
         var spawnify;
 
+        options = options || {};
+        
         assert(command, 'command could not be empty!');
 
-        if (options && options.cwd)
+        if (options.cwd)
             options.cwd = untildify(options.cwd);
         else
-            options     = {
-                cwd: process.cwd()
-            };
+            options.cwd = process.cwd()
 
-        spawnify    = new Spawnify(command, options);
+        spawnify = new Spawnify(command, options);
 
         return spawnify;
     };