WIP: Allow unapplying and reapplying polyfill.

[jgerigmeyer]

This adds a top-level restore function, which attempts to un-apply the polyfill's effects. This allows then re-applying the polyfill, if desired.

This may not be the best solution for #91, but it seemed like a reasonable first step, and might have value on its own as well.

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[jgerigmeyer]

Support for dynamically-added elements.

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