Investigate how to deal with extra clients options

[octonato]

At client side one may need to tweak how the client should work.

The grpc-java implementation has with methods, e.g.: withCompression, withExecutor, withInterceptors, etc. Those methods are added to the stub and returns a new tweaked stub.

We could have something similar or take an approach similar to Lagom's ServiceCall. To be discussed and analysed.

[raboof]

For most of those these it seems you'd rarely want to control it on a per-request basis, so it might be fine to have them as a parameter when constructing the client?

[johanandren]

This was fixed by #201