Initial commit of push messaging "Guestbook" app.
Adding third party code and a sample client secrets file.
Update readme
bump manifest version to 1.23
Fix channelID ownership verification bug.
Bugfixes.
Update OAuth Scope and API Endpoint.
Style cleanup.
Merge branch 'push-guestbook' of https://github.com/mrdewitt/chrome-app-samples

Conflicts:
	.gitignore
Merge branch 'master' of https://github.com/petewil-G/chrome-app-samples
Lowercase sample names and put window create inside onLaunched.addListener