Upload from microphone

Allows users to directly record and upload audio from their microphone on supported browsers. Depends on #487. @jdiez17 merge at will once #487 is in.

![2014-01-12_13 12 27](https://f.cloud.github.com/assets/1310872/1897137/55752d42-7bce-11e3-972a-0b29a0d54c69.png)