Allow comments in tsconfig referenced in AotPlugin conf

[csentis]

OS?

Windows 10

Versions.

node @ v7.5.0

Repro steps.

This happens in an app that wasn't created using the CLI.

• Provide AotPlugin with tsConfigPath
• tsconfig.json referenced has comments starting with '//' in it.
• AotPlugin throws error due to unexpected token '/'.

MS allows for comments in tsconfig, Would be great if ngtools supported this, too.

[hansl]

@sumitarora This is not for 1.0. Sorry for the mis-assignment. For now let's push this one further down the road.

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