Support relative pathing for ng generate statements

[stweedie]

Bug Report or Feature Request (mark with an x)

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

Versions.

node: 6.10.2
os: linux x64
@angular/common: 4.1.3
@angular/compiler: 4.1.3
@angular/core: 4.1.3
@angular/forms: 4.1.3
@angular/http: 4.1.3
@angular/platform-browser: 4.1.3
@angular/platform-browser-dynamic: 4.1.3
@angular/router: 4.1.3
@angular/cli: 1.0.4
@angular/compiler-cli: 4.1.3

Repro steps.

From project root:

ng g component ./src/app/components/test

The log given by the failure.

installing component
  create src/app/src/app/components/test/test.component.scss
  create src/app/src/app/components/test/test.component.html
  create src/app/src/app/components/test/test.component.spec.ts
  create src/app/src/app/components/test/test.component.ts

Desired functionality.

Doesn't create src/app under the (already existing) src/app directory.

This is a minor change, but would then allow me to use autocomplete with the generator, even if the immediate fix is to just remove 'src/app' from the file location input before processing.

Mention any other details that might be useful.

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