basic web latex editor

built with:
  * jquery: https://jquery.com
  * bootstrap: https://getbootstrap.com/
  * ace: https://ace.c9.io/
  * mathjax: https://www.mathjax.org/

TODO:
[ ] populate settings dialog (ace theme, etc)
[ ] add library
[ ] add ability to remove saves
[ ] export
[ ] gist integration
[ ] short URLs