[test dist] Run core tests on npm test

Author: mmalecki

package.json

@@ -28,9 +28,10 @@
   "main": "./lib/node-http-proxy",
   "bin": { "node-http-proxy": "./bin/node-http-proxy" },
   "scripts": { 
-    "test": "npm run-script test-http && npm run-script test-https",
+    "test": "npm run-script test-http && npm run-script test-https && npm run-script test-core",
     "test-http": "vows --spec && vows --spec --target=secure",
-    "test-https": "vows --spec --source=secure && vows --spec --source=secure --target=secure" 
+    "test-https": "vows --spec --source=secure && vows --spec --source=secure --target=secure",
+    "test-core": "test/core/run"
   },
   "engines": { "node": "0.4.x || 0.5.x" }
 }