Fix open redirector in oauth1 login flow.

Clients are no longer allowed to specify callback URLs.
Update docs and examples
Update banner text
Update notices
Update docs and examples to 0.8.0.1
Add 0.7.2.1 to notices
Merge branch 'release-0.8.0.1'

Conflicts:
	docs/.meteor/release
	docs/lib/release-override.js
	examples/clock/.meteor/release
	examples/leaderboard/.meteor/release
	examples/parties/.meteor/release
	examples/todos/.meteor/release
	examples/wordplay/.meteor/release