[mvc] Add missing require declarations for Application and Layout.
[externs] Update w3c_audio externs.
Add AudioParam to AudioNode's connect method parameter.

An AudioNode can modulate an AudioParam with its output.
Add getUserMedia to w3c_audio externs so that it works with advanced compilation.
[components] Widget's render method accepts optional root element.
Fix widget documentation.
Merge pull request #187 from anonrig/master

[components] Widget's render method accepts optional root element.
[components] Change widget render parameter type.

Signed-off-by: ynizipli <ynizipli@sabanciuniv.edu>
Merge pull request #188 from anonrig/master

[components] Change widget render parameter type.