add web-api.ts to patch mediaQuery

[JiaLiPassion]

Based on the PR #543 and #549, I add a new file under lib/browser web-api.ts to patch mediaQuery, and other non-standard api later (for instance, notification API).

the patch in web-api will not be loaded by default, because those api are not supported by all browsers and versions, and it is difficult to tell whether the browser support it or not. So user should load web-api.js by themselves.

And because it is too difficult to test mediaQuery in jasmine,I only add the basic test case to see the prototype is patched or not.

[code-tree]

Great, thanks

Could Web APIs have individual files though, as I need matchMedia now, but I don't necessarily want to include other APIs that might be added to that module in future.

Also, is it best to have min and non-min versions?

(I'm adding this into my build script, so need to know what it'll end up as)

[JiaLiPassion]

@code-tree , yeah, I also considered how to separate the API into different files or modules, I'll do some research about how other API does, if you have some good ideas, please tell me, thank you.