Environment optimized builds

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1. Use feature detection to figure out what features and bugs the current environment has.
2. Then deliver a build of Slick.js that contains only the stuff that this specific environment needs.

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Dojo is working on this sort of thing with has.js and RequireJS and some other stuff.
I'd like to hook into some existing or emerging convention instead of rethinking it ourselves.

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Cf. http://comments.gmane.org/gmane.comp.web.dojo.devel/13600

This thread
discusses some of the mechanics of our approach to branching such that
builds can create using has() branching for to enable build time
optimizations based on feature sets:

Cf. https://github.com/kriszyp/ua-optimized

AMD plugin for UA-based optimization of feature-detection-has.js based modules

-- Kris Zyp