WithBrowser class has a wrong parameter name 

WithBrowser class doesn't have a parameter with name 'browser' but it has a parameter with name 'webDriver'

Ref Link: https://github.com/playframework/playframework/blob/2.1.x/framework/src/play-test/src/main/scala/play/api/test/Specs.scala
Merge pull request #2680 from UttejG/patch-1

Documentation: WithBrowser class has a wrong parameter name