index.stache, development.html should link to steal-sans-promises.js

__Description:__
In a newly generated app, `development.html` and in `index.stache` where the environment is not production, should reference `steal-sans-promises.js`, not `steal.js`.

The reasoning here is the promise shim really messes with the stack, and people are most likely developing with a modern browser because they have the best tools. Production should offer the application to the widest possible audience (with the promise shim for browsers like IE11).

__Environment:__

| Software | Version
| -------------------------- | -------
| donejs -V | 1.0.1
| npm ls generator-donejs | 1.0.7