Allow _.zipObject to accept an array of keys without assuming its an array of key/value pairs. [closes #397]

dist/lodash.compat.js

@@ -5317,6 +5317,9 @@
           length = keys ? keys.length : 0,
           result = {};
 
+      if (!values && length && !isArray(keys[0])) {
+        values = [];
+      }
       while (++index < length) {
         var key = keys[index];
         if (values) {