init: Search for initializer.js in the system path
init: Search for initializer.js in the system path

In the future, `npm install` will put initializer.js in the system
path as `quilt-initializer.js`.

kelda/kelda,kklin/quilt,LuiseV/quilt,ejj/quilt-dev,NetSys/quilt,kklin/kelda,quilt/quilt,quilt/quilt,NetSys/quilt,quilt/quilt,kklin/quilt,LuiseV/quilt,ejj/quilt-dev,kelda/kelda,NetSys/quilt,LuiseV/quilt,kklin/quilt,NetSys/quilt,ejj/quilt-dev,kklin/kelda,kklin/quilt,kklin/kelda,ejj/quilt-dev,kklin/kelda,LuiseV/quilt,quilt/quilt,kelda/kelda,NetSys/quilt,kelda/kelda,LuiseV/quilt