Use yarn

[adi]

This is possible implementation for the request in #2651

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[adi]

I signed it!

[googlebot]

CLAs look good, thanks!

[Brocco]

This will need to have tests associated to get in. And I want to allow the discussion to continue further in issue #2651 to allow others to weigh in.

[filipesilva]

Please add tests as well.

You'll need to modify .travis.yml, .appveyor.yml and to find a way to run a new ng new step.

[filipesilva]

Please revert all changes to this file.

Package name should not change, and the version will be updated via the release process.

The two extra dependencies added are subpackages of this one, and are already added in the appropriate package.json.

[filipesilva]

Please name task YarnInstall and file yarn-install

[adi]

Considering --skip-npm and other possible solutions for running yarn with angular-cli, this PR is not as important as I thought intially.

[mgol]

Just a note - both Angular 1 & 2 as well as other Angular projects are switching their dev systems from npm to yarn. I understand we can't require user projects to do that, though.

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