[Tests] work around npm SSL issue

npm/npm#20191

Author: ljharb

.travis.yml

@@ -16,6 +16,7 @@ node_js:
   - "0.8"
   - "0.6"
 before_install:
+  - 'case "${TRAVIS_NODE_VERSION}" in 0.*) export NPM_CONFIG_STRICT_SSL=false ;; esac'
   - 'nvm install-latest-npm'
 install:
   - 'if [ "${TRAVIS_NODE_VERSION}" = "0.6" ] || [ "${TRAVIS_NODE_VERSION}" = "0.9" ]; then nvm install --latest-npm 0.8 && npm install && nvm use "${TRAVIS_NODE_VERSION}"; else npm install; fi;'