Move templates to separate files
Move requirejs to the lib folder
Convert remaining files to Coffeescript; remove old JS versions

Note: the Verb and Quiz models were converted to CS automatically, so
their old js versions have been preserved for now.
New build process

Precompile the mustache templates and the coffeescript, before feeding
all the resulting js to the requirejs optimizer, which builds a final
script. Also minify the CSS. Then clean out the build folder of the
temporary scripts made along the way and update index.html, which is
copied into build too, to point to the new CSS and the new requirejs
files.
Update tests to work with new build process, and add them in.