add webpack target configuration via angular-cli.json

[vilarone]

Add webpack target config into angular-cli.json

Causes:
When I import electron import { ipcRenderer } from 'electron'; and run with electron ng build complete correctly but in electron renderer cause Uncaught TypeError: fs.readFileSync is not a function

Solution:
Add the webpack target configuration to electron-renderer to compile for electron renderer process
See webpack configuration target for more compile methods
Can usage the other target configuration and predefined the default when undefined in angular-cli.json

Example:

    {
      "root": "src",
      "outDir": "dist",
      "assets": [
        "assets",
        "favicon.ico"
      ],
      "index": "index.html",
      "main": "main.ts",
      "test": "test.ts",
      "tsconfig": "tsconfig.json",
      "prefix": "app",
      "mobile": false,
      "styles": [
        "styles.css"
      ],
      "scripts": [],
      "environments": {
        "source": "environments/environment.ts",
        "dev": "environments/environment.ts",
        "prod": "environments/environment.prod.ts"
      },
      "target": "electron-renderer" <---- new property. ["web","webworker","node","async-node","node-webkit","electron","electron-renderer"]
    }```

[clydin]

This would probably be better served as a new CLI app "type" with custom blueprints, etc.
Although that would be a post-1.0 feature due to the need for the add-on system.

[friksa]

+1 for electron support

btw, angular-cli rocks!!

[filipesilva]

Closing for the same reason as #4227 (comment).

Not to say we won't add it in the future, but it's just not something we're looking at for now.

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