refactor(config): refactor the config object.

[hansl]

This also will load angular-cli.json in the HOME directory as a fallback, supports more stuff from the JSON Schema (like default values) than the old one, and actually verify that what you inputs is the right thing.

This will be its own NPM package at some point, as other people will probably be interested in having a JSON Schema loader that gives type safety and provides fallbacks and metadata.

Closes#1763

[Brocco]

Can we use config.typeOf(jsonPath); here since it's already destructured?

[hansl]

done.

[filipesilva]

What is the addon/ng2/models/json-schema/schema-tree.ts empty file?

[filipesilva]

Can you also add some information on the README about how to use ng config? We have none atm and mostly ask users to edit the file directly.

[hansl]

Re empty file, contains stuff now.
there's no change from the CLI. ng set and ng get are still the same.

[filipesilva]

It's true that they are the same, but we have no documentation whatsoever for users to use them, so no one but us knows how to use this functionality.

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