Initial commit.
Add link to a live demo.
Added an authors list, in the style of Chromium.
Renamed podcast.html -> index.html .

This allows us to have a cleaner demo URL:
https://mbrukman.github.io/delayed-replay/
instead of:
https://mbrukman.github.io/delayed-replay/podcast.html
Updated live and local URLs due to file rename.
Added contribution guide.
Moved xml2json tests to `tests` dir.
Moved Python tests into `tests` dir.
Moved Javascript files into `js` dir.