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

[mjstahl]

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

[chasenlehara]

I wonder if it’s a bug that the shim is even used in newer browsers; seems like we’d want to default to the native implementation if it’s there, and only shim if it’s not.