feat(scenario): expose jQuery for usage outside of angular scenario

We are using jQuery in some custom angular scenario dsl methods. Unfortunately the jQuery included in angular-scneario is not available for us, because via noConflict() the global reference is removed and only a local reference is kept. To remove the necessity to include a second jQuery in our test setup, this commit adds a angular.scenario.jQuery variable, making jQuery available for others.

I already signed the CLA. My full name is Andreas Marek.

Best regards