add option for adding component to entryComponents when generating new component #7749

- [ ] bug report -> please search issues before submitting
- [x] feature request

Versions.

@angular/cli: 1.3.2
node: 6.10.1
os: win32 x64
@angular/animations: 4.3.6
@angular/cdk: 2.0.0-beta.8
@angular/common: 4.3.6
@angular/compiler: 4.3.6
@angular/compiler-cli: 4.3.6
@angular/core: 4.3.6
@angular/flex-layout: 2.0.0-beta.9
@angular/forms: 4.3.6
@angular/http: 4.3.6
@angular/language-service: 4.3.6
@angular/material: 2.0.0-beta.8
@angular/platform-browser: 4.3.6
@angular/platform-browser-dynamic: 4.3.6
@angular/platform-server: 4.3.6
@angular/router: 4.3.6
@angular/cli: 1.3.2
@ngtools/webpack: 1.6.2

Desired functionality.

ng new c someComponent --entry: add created component to entryComponents of owner module.