Correctly setup Parallel coveralls

.travis.yml

@@ -1,15 +1,21 @@
 language: node_js
 sudo: false
 script: npm run ${NPM_SCRIPT}
-after_success: cat ${TRAVIS_BUILD_DIR}/coverage/lcov.info | coveralls
 node_js: '4'
+notifications:
+  webhooks: https://coveralls.io/webhook?repo_token=${COVERALLS_REPO_TOKEN}
+after_script: cat ${TRAVIS_BUILD_DIR}/coverage/lcov.info | coveralls
 env:
   global:
   # SAUCE_USERNAME
   - secure: g1hP6mcOh5BRX1+4yxm6/vXYoWIHwNoIIIn0wfT8iFe8TIPwf8xAddXgU6KRAW8gUrS6hZvblpEyhz6khJ7pHsxcla5FmGg5ok8uvaD5H7o0ihmaWAOw8YYD9KgwZz6cJEk9EtsXUQmxwiDFO0Y03f97B8nxp56ENXzHQ7JGoQ4=
   # SAUCE_ACCESS_KEY
   - secure: UondfJRnFfyjIOHoC5CXMiC8kPotq4dmgI93G5KETC2yLplRMNLBGSgaa+wuow3kDk0gDamYPWl/wV0tGbKG5qAvtm8DcvgONzIamTKYElf+7wmeHSoBZQ8vbrvu2Eo+zw8kGIzreBvOnm8TxpTM1vE6mAtfXq+aBGhW3l/2Mkw=
+  # COVERALLS_REPO_TOKEN
+  - secure: SFvPFSDBhVHx9sFwPcWTb0SK18ObevyspkmDumVF32HR/AQlT0RJOJJQMQHgq0a8wzgvSG+AcJkrihNubmcOwKLiTP8pX3o96BkyBLWFHxWbfBDzuYXRCkcDAWgOYEQDElYIbEPFIsBfvuu92Xc+Mhwrf+aKRnQqsIhgPvLXKJI=
+
   - CXX=g++-4.8
+  - COVERALLS_PARALLEL=true
 
 cache:
   directories: