allow overriding `bailMode`

[KiaraGrouwstra]

angular-cli hardcodes webpack's bail setting as true, which cancels any build while there are remaining TS errors.
I find this unfortunate as TypeScript is imperfect, meaning there may be cases where it would be significantly harder to fully resolve all TS errors, while functionality may be just fine.
I understand that bail mode has significant advantages (error codes) as well. Would it perhaps be an option to allow having certain/general webpack settings overridden by the user using angular-cli.json somehow?
I'm actually a bit surprised I hadn't found things about extending webpack settings yet, as this might make ng-cli more flexible in general, hopefully allowing the user to add Pug/Less/Stylus at will as well (without having to bloat ng-cli with additional dependencies).
Thoughts?

[filipesilva]

Fixed in #2879.

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