Try using runtests-parallel for CI (#9970)

* Try using runtests-parallel for CI

* Put worker count setting into .travis.yml

* Reduce worker count to 4 - 8 wasnt much different from 4-6 but had contention issues causing timeouts

.travis.yml

@@ -7,12 +7,16 @@ node_js:
 
 sudo: false
 
+env:
+  - workerCount=4
+
 matrix:
   fast_finish: true
   include:
   - os: osx
     node_js: stable
     osx_image: xcode7.3
+    env: workerCount=2
 
 branches:
   only:

package.json

@@ -78,7 +78,7 @@
     },
     "scripts": {
         "pretest": "jake tests",
-        "test": "jake runtests",
+        "test": "jake runtests-parallel",
         "build": "npm run build:compiler && npm run build:tests",
         "build:compiler": "jake local",
         "build:tests": "jake tests",