Move reflect-metadata to a peer dependancy

[waterfoul]

OS?

All

Versions.

All versions after 1.0.0-beta.20-1

Repro steps.

Look at the package.json in an installed angular-cli

The log given by the failure.

Mention any other details that might be useful.

If two modules import different versions of this module it will cause some very confusing errors. By including it as a peer npm will output a warning upon detecting a version mismatch and will only install the newer of the mismatched versions. Situations like this is the whole reason the concept of peer dependencies exists

[CarreraPHP]

#3655 pull request removes the need for reflect-metadata in cli and @ngtools webpack. If & when merged, this issue will no longer be required.

[filipesilva]

Fixed by #3655

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