Allow codecombat to run through decaffeinate on recent node (#119)

It looks like running decaffeinate in node 8 will probabbly save a few minutes
from the build and hopefully make it much less likely to time out. Also split
the config up into multiple commands so it's easier to see timing information.

Author: alangpierce

examples/codecombat/config.js

@@ -6,33 +6,32 @@ export default {
     'babel-plugin-transform-remove-strict-mode',
     'babel-loader',
   ],
-  testCommands: [`
+  testCommands: [
+    `
     set -e
     export COCO_TRAVIS_TEST=1
     export DISPLAY=:99.0
     if [ -e /etc/init.d/xvfb ]; then
       sh -e /etc/init.d/xvfb start
     fi
     rm -rf public
-    # Some dependency issues make the install fail the first time, so just try again.
-    npm install || npm install
-    # node-sass doesn't get set up correctly for some reason, so set it up again.
-    npm install node-sass
-    npm install request
-    
-    ./node_modules/.bin/bower install
-    ./node_modules/.bin/webpack
-    
-    git add -f public/javascripts/test.js
-    git commit -m 'Save bad built JS file for diagnostic purposes'
-    
-    node index.js --unittest &
+    `,
+    'nvm install 5.10.1',
+    // Some dependency issues make the install fail the first time, so just try again.
+    'npm install || npm install',
+    // node-sass doesn't get set up correctly for some reason, so set it up again.
+    'npm install node-sass',
+    'npm install request',
+    './node_modules/.bin/bower install',
+    './node_modules/.bin/webpack',
+    'node index.js --unittest &',
+    `
     n=0
     until [ $n -ge 60 ]; do curl http://localhost:3000 && break; n=$[$n+1]; sleep 1; done
-    
-    ./node_modules/karma/bin/karma start --browsers Firefox --single-run --reporters dots
-    npm run jasmine
-  `],
+    `,
+    './node_modules/karma/bin/karma start --browsers Firefox --single-run --reporters dots',
+    'npm run jasmine',
+  ],
   expectConversionSuccess: true,
   expectTestSuccess: true,
 };