[RFC 2195] Document new type representations#246

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Havvy wants to merge 3 commits intorust-lang:masterfrom

Havvy:type-layout

Commits on Feb 17, 2018

Document new type representations
Havvy
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Commits on Feb 18, 2018

Organization of reprs
Havvy
committed

Commits on Feb 19, 2018

WIP Address alercah's concerns
Havvy
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