Configure updater for standalone page

An annotation standalone page should only listen to news from
the showed annotation and its replies. This has been lost in the
our series of refactoring.

Now it is restored.

Fix #1427
Add fake  for the controller tests
Removed repeated information
Merge pull request #1464 from RichardLitt/patch-1

Removed repeated information.
Merge pull request #1452 from hypothesis/1427-configure-standalone-updater

Configure updater for standalone page.
Add unicode normalization for page search
Unicode normalization for stream backend