compatible with angular : 6.0.0-rc.0 and rxjs 6.0.0-beta.1

[xmlking]

1. Compatible with angular 5.x and 6.x
   For Angular v5 users, Option 1
   For Angular v6 users, Option 2
   1. Option 1:
      rxjs: "5.6.0-forward-compat.1"
   2. Option 2:
      "rxjs": "6.0.0-beta.1",
      "rxjs-compat": "6.0.0-beta.1",
2. Packaging with ng-packagr

source without generated files
build npm run build
test npm run test
publish npm publish dist --access public

4. integration tests
   run test app npm run start

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[xmlking]

I signed it!

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CLAs look good, thanks!

[xmlking]

For prelease testing with Angular 6.0.0-rc.0
npm i @xmlking/angular-in-memory-web-api

[wardbell]

I'm closing because I only want to support RxJS v.6 and do not intend to support backward compat library which is deprecated in Angular v7.

Moreover, this PR updates far too many files.

But thanks for you interest and I hope you continue to find value in this library.