Merge pull request ampproject#2429 from erwinmombay/fix-bug

remove reference to whenFirstLayoutCompleteResolve_

whitelist branches with the name amp-release-.* for a travis build

Merge pull request ampproject#2341 from cramforce/unique-canary

Turn on unique origins for dev channel by default.

Merge pull request ampproject#2312 from cramforce/typo

Fix crucial typo.

Merge tag '1456432550041' into release

Merge pull request ampproject#2284 from erwinmombay/dont-error-not-em…

…bedded

Reject messaging promise if not embedded.

Merge pull request ampproject#2262 from cramforce/timeout-message

Always log when channel with parent cannot be established.

Merge tag '1456286053779' into release

Merge pull request ampproject#2253 from dvoytenko/fixes51

Extend messaging channel timeout to 20s

Merge tag '1456275888387' into release