SDL/emscripten audio capture test!

To use this:

• Note that Apple WebKit (Safari, Chrome on iOS, etc) does not support audio capture at the moment.
• Chrome (Windows/Mac/Linux/Android) and Firefox should work.
• Plug in a microphone, turn on your speakers.
• Approve use of your microphone when the browser asks. We will not save or transmit anything from your machine!
• Hold your left mouse button (or finger on touch screens) on the red square to start recording. The square will turn green.
• Let go to stop recording. The square will turn red again.
• What you just recorded will play back.
• Repeat as much as you like.
• Report success and failure to Ryan by either email or Twitter.

thanks!
--ryan.