More normalize

This brings in all of the custom normalizing we are currently doing in asimov-platform-settings. I've opted to put the relevant parts where they currently exist in this file, following the numbered comments where applicable. This basically makes this our own normalize, and we're responsible for understanding what each line is doing. Any future modifications brought in from the official Normalize or html5bootstrap should be considered on a per property basis anyway.

@andrewk @dannymidnight @xzyfer