Stripping pragmas

This adds r.js-usable pragmas to compiler and exporter output. The dev files gets bigger and littered with pragma lines (mainly because each .sendIdx setting needs pragma exclusion, too), but you can produce deploy set in 0.13 projects when you add

```
    pragmas: {
        excludeIdeData: true,
        excludeDebugContexts: true
    },
```

into your `deploy.build.js`.
`add:` returns the added element