Support for Typescript 2.1

[henriquecustodia]

Hi folks!

Would be very good angular-cli to support Typescript 2.1.

https://blogs.msdn.microsoft.com/typescript/2016/12/07/announcing-typescript-2-1/

Thanks!

[filipesilva]

Heya, we plan to add it soon but currently waiting on angular/angular#13294.

[hccampos]

@filipesilva looks like this is moving. angular/angular#13294

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