Merge pull request #7137 from tschaub/updates

Developer documentation updates

DEVELOPING.md

@@ -17,7 +17,7 @@ The minimum requirements are:
 
 * GNU Make
 * Git
-* [Node.js](http://nodejs.org/) (higher than 0.12.x)
+* [Node.js](http://nodejs.org/) (version 8 and above)
 * Python 2.6 or 2.7
 * Java 7 (JRE and JDK)
 

test/README.md

@@ -18,6 +18,12 @@ Run the tests once:
 
     npm test
 
+This will run tests in Chrome.  If you do not have Chrome installed, you can run tests on Firefox instead:
+
+    npm test -- --browsers Firefox
+
+To run tests in other browsers, you need to install [additional Karma launchers](http://karma-runner.github.io/1.0/config/browsers.html).
+
 To run the tests continuously:
 
     npm run karma