How to set up fixtures properly.

A recipe to set up fixtures so they only get loaded in development/testing but not in production. (It might be also nice to have a flag to be able to prevent fixtures from loading in development mode).

E.g: using [configDependencies](http://stealjs.com/docs/npm.html) https://gist.github.com/matthewp/2e3a1f54555607390274

Start by reading the linked configDependencies documentation and the referenced gist to understand the proposed fixture-loading setup. Document a recipe that loads fixtures only in development and testing, and explain whether a development-mode opt-out flag is feasible; done means the recipe clearly excludes production loading.

Written by the indexing model from the issue text.