Feature request: angular-cli.json > assets supporting array of values

Please provide us with the following information:

OS?

Windows 7, 8 or 10. Linux (which distribution). Mac OSX (Yosemite? El Capitan?)
Windows 10

Versions.

Please run ng --version. If there's nothing outputted, please run in a Terminal: node --version and paste the result here:

$ ng --version
angular-cli: 1.0.0-beta.15
node: 4.4.7
os: win32 x64

Repro steps.

Was this an app that wasn't created using the CLI? What change did you do on your code? etc.
I've got several asset folders under src: src/images, src/img, src/fonts that have to be copied to the dist folder.

When running ng build / ng build --prod, those resources are missing.

The config option app-> assets only supports one string, not an array of strings.

[filipesilva]

I changed the title to better reflect what this issue is meant to be asking.

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