Docs: Clarify PHP Usage

Clarify that PHP is not required for testing and add a link to the
CONTRIBUTING page.

Author: lukeapage

CONTRIBUTING.md

@@ -18,15 +18,20 @@ Every week (unless otherwise noted) the jQuery UI team has a meeting to discuss
 
 ## Tips For Bug Patching
 
-### Environment: localhost w/ PHP, Node.js & Grunt
+### Environment: minimum required
+
+The tests can run in any local web server. Ideally you should test your patch in appropriate web browsers and if possible run `grunt` to lint the code and run automated tests (this will happen automatically when you create a pull request).
+
+### Environment: Recommended setup
 
 jQuery UI uses Node.js & Grunt to automate the building and validation of source code.
 
-Some tests depend on PHP running locally, so make sure you have the following installed:
+The tests require a local web server and the samples contain some PHP, so a PHP web server may be useful.
 
-* A web server with PHP support (any will do, such as [XAMPP](http://www.apachefriends.org/en/xampp.html) or [MAMP](http://www.mamp.info/en/index.html))
-* [Node.js](http://nodejs.org/) (includes NPM, necessary for the next step)
-* Grunt (install with: `npm install -g grunt`)
+* Get [Node.js](http://nodejs.org/) (includes NPM, necessary for the next step)
+* Install Grunt cli (install with: `npm install -g grunt`)
+* Install local modules (`npm install` in the root directory)
+* Install a web server (PHP support optional - such as [XAMPP](http://www.apachefriends.org/en/xampp.html) or [MAMP](http://www.mamp.info/en/index.html) or for node you can use [http-server](https://www.npmjs.com/package/http-server))
 
 ### Build a Local Copy of jQuery UI
 

README.md

@@ -21,16 +21,18 @@ In general, fork the project, create a branch for a specific change and send a
 pull request for that branch. Don't mix unrelated changes. You can use the commit
 message as the description for the pull request.
 
+For more detailed information, see the [contributing page](CONTRIBUTING.md).
 
 ## Running the Unit Tests
 
-Run the unit tests with a local server that supports PHP. No database is required. Pre-configured php local servers are available for Windows and Mac. Here are some options:
-
+Run the unit tests manually with appropriate browsers and any local web server. Here are a selection you could use.
 - Windows: [WAMP download](http://www.wampserver.com/en/)
 - Mac: [MAMP download](http://www.mamp.info/en/index.html)
 - Linux: [Setting up LAMP](https://www.linux.com/learn/tutorials/288158-easy-lamp-server-installation)
 - [Mongoose (most platforms)](http://code.google.com/p/mongoose/)
+- [http-server](https://www.npmjs.com/package/http-server)
 
+You can also run the unit tests inside phantomjs by [installing node](http://nodejs.org/) and the required modules(`npm install`) and then running `grunt test`.
 
 ## Building jQuery UI