Es6 mod improvements

- [x] make it work with the new compiler
- [x] node tests
- [x] a+ tests
- [x] CJS output
- [x] UMD output
- [ ] clean up tooling
- [ ] make browser test work (for local webserver)
- [x] es3 AMD: https://github.com/square/es6-module-transpiler/issues/133 (UMD)
- [ ] perf https://github.com/square/es6-module-transpiler/issues/132