better package structure, commented out types

Same structure as generated by appium-package-master.
Actually been playing with this, it's pretty cool, appium-gulp-plugins now optionally support rtts-type, commented or not:

Try:
```
gulp once --rttsAssert
gulp watch --rttsAssert
```

wrote a test https://github.com/sebv/node-simctl/blob/better-package/test/simctl-specs.js#L61