a test that tries to run two builds at once
Updates to the new systemjs

This updates us to the latest systemjs as is merged in bitovi/systemjs.
All tests passing.  One change that is possibility controversial:

SystemJS no longer supports the `__useDefault` option in es6 modules to
import into non-es6 formats as the module's value. Instead any non-es6
module that imports an es6 module can use use it's `default` property.
Updates to SystemJS 0.8.2, ES6ML master

Updates us to the lastest of both.
Makes @loader work with es6

This updates to the latest steal, systemjs, and es6-module-loader with
fixes for running es6 modules with multiple loaders loading at the same
time.
Add test for transpiling CommonJS modules

This was broken in <= 0.4.0, CommonJS modules after being transpiled
would export an object that included the module value's including
`exports`. This is fixed by the SystemJS upgrade. Just adding the test
to verify it doesn't happen again. Fixes #85