Add custom SoundCloud-replacement audio playback widget

[gmittal]

We might need to leave SoundCloud's platform, which means that all of the audio content would be hosted on GitHub pages and run directly on the website. Experiment with hosting solutions and client-side playback widget options/design.

[gmittal]

There are a bunch of simple solutions out there, but it would be nice to have an audio player with the look and feel of the SoundCloud player.

These might help:

• http://www.waveformjs.org/
• https://kolber.github.io/audiojs/