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Improve docs for ComponentElement (#5829)

Also, make ProxyWidget and ProxyElement public.

Fixes #4505
A
Adam Barth committed
9109bb02b96a06e429308c6cd99b1c7fbc636453
Parent: cc1755a
Committed by GitHub <noreply@github.com> on 9/15/2016, 4:15:11 PM