update angular2 to beta version 13

[deebloo]

Update angular2 version

[jkuri]

Hi @deebloo, thanks for your PR. Please amend your commit message to something like
chore: update angular2 to beta version 13 to be consistent with https://github.com/angular/angular-cli/blob/master/CONTRIBUTING.md#commit. Thanks.

[deebloo]

apologies didn't read the doc closely enough. let me know if there is anything else I missed.

[jkuri]

No problem :-). Close #376.

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