Use the latest version of the transpiler (v0.8.3).

I actually pushed broccoli-compile-modules to npm as v1.0.0, which references v0.8.3. This changes the semantics of `export default function foo() {}` to be interpreted as a `FunctionDeclaration`, which should have no behavioral effect on RSVP.

I had to use a new version of the AMD formatter to support this, but I cannot actually find any output for the AMD formatter after running `ember build --production`.