[Tests] fix npm upgrades for older nodes

.travis.yml

@@ -30,7 +30,10 @@ node_js:
   - "0.6"
   - "0.4"
 before_install:
-  - '[ "${TRAVIS_NODE_VERSION}" = "0.6" ] || npm install -g npm@1.4.28 && npm install -g npm'
+  - 'if [ "${TRAVIS_NODE_VERSION}" != "0.9" ]; then case "$(npm --version)" in 1.*) npm install -g npm@1.4.28 ;; 2.*) npm install -g npm@2 ;; esac ; fi'
+  - 'if [ "${TRAVIS_NODE_VERSION}" != "0.6" ] && [ "${TRAVIS_NODE_VERSION}" != "0.9" ]; then npm install -g npm; fi'
+script:
+  - 'if [ "${TRAVIS_NODE_VERSION}" != "4.2" ]; then npm run tests-only ; else npm test ; fi'
 sudo: false
 matrix:
   fast_finish: true

package.json

@@ -6,7 +6,8 @@
 	"license": "MIT",
 	"main": "index.js",
 	"scripts": {
-		"test": "npm run lint && node test/index.js && npm run security",
+		"test": "npm run lint && npm run tests-only && npm run security",
+		"tests-only": "node test/index.js",
 		"coverage": "covert test/*.js",
 		"coverage-quiet": "covert test/*.js --quiet",
 		"lint": "npm run jscs && npm run eslint",