Prerequisites

Install Spring Tool Suite (http://www.springsource.org/downloads/sts-ggts)
Install Maven from the Eclipse Marketplace (Help menu)
Install the JBehave plugin (https://github.com/Arnauld/jbehave-eclipse-plugin)
Install eGit from the Eclipse Marketplace (Help menu), if you prefer to pull/push from within eclipse.

How to run it

Run the project with the following run configurations: mvn clean integration-test -Dgroup=google

start your hub

java -jar selenium-server-standalone-2.40.0.jar -role hub
start your nodes (you need at least as many nodes as the threads specified in in the pom.xml)

java -jar selenium-server-standalone-2.40.0.jar -role node -port 5588 -hub http://localhost:4444/grid/register -browser browserName=firefox,maxInstances=1,platform=LINUX

java -jar selenium-server-standalone-2.40.0.jar -role node -port 5599 -hub http://localhost:4444/grid/register -browser browserName=firefox,maxInstances=1,platform=LINUX

java -jar selenium-server-standalone-2.40.0.jar -role node -port 5500 -hub http://localhost:4444/grid/register -browser browserName=chrome,version=33,chrome_binary=/path/to/chrome/driver/binary,maxInstances=1,platform=LINUX
start the tests with Firefox

mvn clean integration-test -Dgroup=google -DseleniumGrid=true
start the tests with a custom browser (Ensure drivers are up to date, See driver download locations below)

mvn clean integration-test -Dgroup=google -Dbrowser=chrome -DseleniumGrid=true