Revert "Fixing Travis build errors"

This reverts commit f6c9e0f0.

.travis.yml

 language: node_js
 node_js:
-  - 'iojs'
-  - '0.12'
-  - '0.10'
+  - 0.6
+  - 0.8
+  - 0.10
+  - 0.12

package.json

@@ -28,7 +28,7 @@
     "main": "./lib/jsonpath",
     "dependencies": {},
     "devDependencies": {
-        "nodeunit": "0.9.0"
+        "nodeunit": "0.8.8"
     },
     "scripts": {"test": "./node_modules/.bin/nodeunit test"}
 }