Support AMD "module" import

[m-mujica]

Testing that the transpile changes work fine with steal-tools and that module like:

define(["module"], function(module) {
  doSomethingWith(module);
});

are handled correctly in optimized builds.

Closes #845

[coveralls]

Coverage remained the same at 92.66% when pulling 137a64e on module into 072cbf2 on master.

[matthewp]

👍