SIGN IN SIGN UP

Fix Material docs (#6781)

...by reverting us to an earlier dartdoc package.

Also I added a sanity test to make sure that we don't regress this again.
I
Ian Hickson committed
690ec450959b1e928b05193df7a6e6623de9a795
Parent: 49b5701
Committed by GitHub <noreply@github.com> on 11/9/2016, 11:16:13 PM