Wait for integration results

[cojoj]

Right now the available API allow you to postIntegration but it returns immediately. It'd be nice if callback could wait for integration to finish, but also a protocol informing about this fact would be nice.

[czechboy0]

We can just add an extra param waitUntilCompleted: Bool to the postIntegration call.

[cojoj]

Sounds like a great plan 😉