test: add test for NodeJS compatibility

The test is a simple addition to the existing tests. It should ensure
that the built Handlebars artifact only uses language features that are
available in old versions of NodeJS. A simple program and the
precompiler are started with NodeJS 0.10 to 11

.travis.yml

@@ -3,6 +3,7 @@ before_install:
 - npm install -g grunt-cli
 script:
 - grunt --stack travis
+- multi-nodejs-test/run-tests.sh 0.10 0.12 4 5 6 7 8 9 10 11
 email:
   on_failure: change
   on_success: never