Add 'test-node' script target.

Author: davidlehn

package.json

@@ -95,7 +95,8 @@
     "prepublish": "npm run build",
     "build": "webpack",
     "test-build": "webpack --config webpack-tests.config.js",
-    "test": "cross-env NODE_ENV=test mocha -t 30000 -R ${REPORTER:-spec} tests/unit/index.js",
+    "test": "npm run test-node",
+    "test-node": "cross-env NODE_ENV=test mocha -t 30000 -R ${REPORTER:-spec} tests/unit/index.js",
     "test-karma": "karma start",
     "test-karma-sauce": "karma start karma-sauce.conf",
     "test-server": "node tests/server.js",