chore(CHANGELOG.md): add changelog for 1.3.0-beta.3
chore(release): update cdn version
docs(error/ng/btstrpd): fix typo in error page

Minimal typo fix

Closes #6803
docs(guide/directive): fix broken link

Fix broken internal link in directive documentation.

Closes #6802
chore(npm-shrinkwrap): update dgeni-packages dependency
docs(faq): fix link to Closure Library

The previous link throws a 404.