Polymer init should include generators which are scoped packages

[ncraley]

When listing the available generators, polymer init should include those generators of the form @scope/generator-polymer-init-*

Currently, polymer init checks for startsWith('polymer-init') when filtering the available generators (generator is stripped by Yeoman).

Checking instead for a match with /^(@[^\/]+\/)?polymer-init.*/ would allow scoped packages to show up.

[stale]

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