Change to more conventional repository structure

[jrhorn424]

In order to ease deployment, I suggest moving all files into a src or app directory, and then building to a dist directory. Additionally, using a tmp folder for deployment to github pages allows us to copy files to the gh-pages branch without using a .gitignore.

[jrhorn424]

Created an app directory and moved source files. Next step is to integrate https://www.npmjs.com/package/html-webpack-plugin so we can build a dist/index.html from app/index.hbs or app/index.html.