Introduce polyfill for getUserMedia to increase browser/platform coverage

[MrCsabaToth]

Candidates:

• https://github.com/addyosmani/getUserMedia.js
• https://github.com/Temasys/AdapterJS

Questions:

• mobile browser coverage
• if there getUserMedia support is there MediaStreamTrack

[MrCsabaToth]

For other polyfills see Modernizr https://github.com/Modernizr/Modernizr/wiki/HTML5-Cross-browser-Polyfills