Avoid creating component with unicode naming, instead of throwing error after finishing creation.

Bug Report or Feature Request (mark with an x)

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

Versions.

Angular CLI: 1.5.0 Node: 8.7.0 OS: darwin x64

Repro steps.

Using unicode naming when creating component succeeds:

$ ng generate component 英雄
  create src/app/英雄/英雄.component.css (0 bytes)
  create src/app/英雄/英雄.component.html (25 bytes)
  create src/app/英雄/英雄.component.spec.ts (628 bytes)
  create src/app/英雄/英雄.component.ts (310 bytes)
  update src/app/app.module.ts (398 bytes)

But it results in error.

The log given by the failure.

As @clydin kindly pointed out below, error below is the same as https://github.com/angular/angular-cli/issues/8386, thus most likely not related with the unicode naming.

英雄.component.ts:7 Uncaught ReferenceError: ViewEncapsulation is not defined
    at eval (英雄.component.ts:7)
    at eval (英雄.component.ts:18)
    at Object.../../../../../src/app/英雄/英雄.component.ts (main.bundle.js:58)
    at __webpack_require__ (inline.bundle.js:55)
    at eval (app.module.ts:5)
    at Object.../../../../../src/app/app.module.ts (main.bundle.js:36)
    at __webpack_require__ (inline.bundle.js:55)
    at eval (main.ts:4)
    at Object.../../../../../src/main.ts (main.bundle.js:74)
    at __webpack_require__ (inline.bundle.js:55)

Desired functionality.

Error out when creating component in such way, similar as creating a project with unicode naming:

$ ng new 英雄榜
Project name "英雄榜" is not valid. New project names must start with a letter, and must contain only alphanumeric characters or dashes. When adding a dash the segment after the dash must also start with a letter.
英雄榜
^

Mention any other details that might be useful.

[clydin]

The error shown above is a known issue (https://github.com/angular/angular-cli/issues/8386) and is not related to unicode filenames.

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