Add a decorator for setting document title

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[x] feature request
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Current behavior We need a Title Service as described in the Set Document Title Cookbook.

Suggested behavior Using a decorator to bind the title, along the lines of @HostBinding(title:text) or @HostBinding(title:innerHTML), or maybe even entirely new decorator such as @TitleBinding.

What is the motivation / use case for changing the behavior?

It’s a bit weird that binding to window is so easy and setting the title so hard. We can already access window with a decorator so why not access title the same way?

• Angular version: 2.0.0
• Browser: all
• Language: TypeScript

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