This is a composer compatible version of the standalone Selenium server. It's designed to mirror the version numbers of selenium itself.
To include in your project, add the following line to your composer.json file:
"pawcode/selenium-standalone": 2.*
Or to have composer do it for you:
$ composer.phar require pawcode/selenium-standalone:2.x
Once in your project, you can run it from the vendor/bin directory:
$ java -jar bin/selenium-standalone.jar