Added README and enabled JavaScript tests on Node.js
diff --git a/travis.sh b/travis.sh
index 4b9ad10..27e4990 100755
--- a/travis.sh
+++ b/travis.sh
@@ -273,6 +273,11 @@
   cd ruby && bash travis-test.sh jruby && cd ..
 }
 
+build_javascript() {
+  internal_build_cpp
+  cd js && npm install && gulp test && cd ..
+}
+
 # -------- main --------
 
 if [ "$#" -ne 1 ]; then