Way to install portaudio as a dependency

[iamajoe]

As it is for now, you have to install portaudio lib as a standalone before using this module but lets say I want to wrap an app with electron and sell it. We shouldn't ask the client to install portaudio. Dependency should already be included.

[justinmchase]

I agree, port audio code should be in a sub folder and should have a .gyp file so its easy to build this project. I'm thinking about working on doing that.