Implement compaund Web Test

Would love to have a feature like this, I am currently rebuilding our existing suite of tests from Visual Studio in Load Ninja and this is the one thing I can already see if going to be missed and will make maintaining tests harder going forwards.

With all of my previous work I created it under an encapsulated approach so that I could maintain commonly used scripts, for example, a test that goes to the homepage, then logs in, opens an account and logs out would be 4 parts that could be easily maintained and then reused multiple times to make other tests like Home > Login > Logout, Home > Products, etc all reusing the same scripts that if changed I only had to alter once to update.