Fix js examples: use submodule to reference echonest/remix.js

The js examples were broken. If development of remix.js is going to continue in a separate repository, it makes sense to use submodules to reference it and manually sync up, rather than copy-pasting.

Second part of this pull request is an issue against remix.js gh-pages branch, swap the order of loading bootstrap.min.js and jquery: https://github.com/echonest/remix.js/issues/1

Our team @olinjs is using this repository, and excited about the sprint! Can't wait to see some awesome mashups with remix.js