Suggestion: Move `@angular/*` from devDependencies to `peerDependencies`

[leocaseiro]

• I'm submitting a ... [ ] bug report [x] feature request [x] question about the decisions made in the repository

• Do you want to request a feature or report a bug? Feature/improvement

• What is the current behavior? Currently, we're installing multiple versions of angular (when testing with angular 5).

• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via https://plnkr.co or similar.

• What is the expected behavior? We should rely on the @angular/* versions installed in the app. However, we could and should leave the @angular/cli, @angular/compiler, @angular/compiler-cli, and @angular/language-service in devDependencies still.

• What is the motivation / use case for changing the behavior? be able to test any @angular@next avoiding conflict issues, such as

  ERROR in Error: Metadata version mismatch for module

• Please tell us about your environment:

  @angular/cli: 1.4.4
  node: 8.6.0
  os: darwin x64
  @angular/animations: 5.0.0-rc.0
  @angular/cdk: 2.0.0-beta.11
  @angular/common: 5.0.0-rc.0
  @angular/compiler: 5.0.0-rc.0
  @angular/core: 5.0.0-rc.0
  @angular/flex-layout: 2.0.0-beta.9
  @angular/forms: 5.0.0-rc.0
  @angular/http: 5.0.0-rc.0
  @angular/material: 2.0.0-beta.11
  @angular/platform-browser: 5.0.0-rc.0
  @angular/platform-browser-dynamic: 5.0.0-rc.0
  @angular/router: 5.0.0-rc.0
  @angular/cli: 1.4.4
  @angular/compiler-cli: 4.4.4
  @angular/language-service: 4.4.4
  typescript: 2.5.3

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, gitter, etc)

https://stackoverflow.com/questions/18875674/whats-the-difference-between-dependencies-devdependencies-and-peerdependencies

[akserg]

Implemented in 5.0.1