Remove rxjs from imports

[thymikee]

As stated here: angular/angular-cli#4543 (comment).
It shouldn't be auto included. Although need to add a guide on some useful imports like:

import 'rxjs/add/operator/map';
import 'rxjs/add/operator/switchMap';
import 'rxjs/add/operator/do';
import 'rxjs/add/operator/catch';

[thymikee]

For lots of folks it would be a breaking change, so I'd publish it as v1.
We could also add above as defaults, which resulted in ~10% faster test runs in my case.

cc: @Meligy

[Meligy]

As someone who got bitten by inclusion of RxJS, I'd really say please do not include it.

It should show an error, which tells people that they are missing something.

Since this project is meant for the Angular CLI, I'd suggest it should be as close as possible to what it puts in src/test.ts (source).

Only add stuff that is required to get jest running, and if possible, try to use the polyfills.ts that is already in the project as well. People can use this for common RxJS operators if they want.

[Meligy]

And, on another side, something that I have not mentioned but really should have: This project is SUPER AWESOME, and does make what seemed a very tough job become super nice. Thanks heaps.

[thymikee]

Yeah, so we can't really use polfills.ts because it includes browser version of Zone. However we can import frequent rxjs operators (like map) in the setupJest.ts file. I'll post a guide later today.