Update selectedAnnotations at annotationUpdate event.

If we got annotations selected in the sidebar and delete one, the filter
doesn't get updated. Alas, if we delete the last selected annotation then
the sidebar will show zero annotations but the filter will still say:
"Showing x annotations..."

This fix gives a new listener to the annotationDeleted event and properly
updates the selected annotation dict and count if needed.

Fix #1591

Style the deleted annotation message

Kill console log messages.

This was only used by the old (non-unified) stream template.

When switching tabs on our /login route, the scope.on 'destroy' is
fired in the AuthController which emits an auth event with undefined
data value.

Our AuthAppController was trying to check the data.userid for this
undefined value. We only need to do that when data is undefined.

Fixes #1627

Simplify highlight visibility toggling.

Sort orphan placeholders to bottom of stream

setVisibleHighlights was previously two methods disguised as one, behind
the "notify" parameter. This commit moves all the code related to
actually changing local state into the onSetVisibleHighlights handler,
making the setVisibleHighlights function responsible solely for firing
the event.

This makes it possible to call instance methods on the current plugin
from event handlers, without the additional indirection through
window.annotator.

Fix #1618

As discussed in https://github.com/hypothesis/annotator/pull/78.

Fixes https://github.com/hypothesis/h/issues/1598.

stats: Use statsd client for collecting auth metrics

Check to see if an annotation has multiple titles

Fixes the issue where a document title appears in square brackets.

Use the icon font for the adder

Move to using a Chrome browser action

Update the last login date for users

Post install onboarding page

If the firstRun option is provided to the hypothesisConfig.

This saves the implementor redefining the defaults if they only want
to override one or two options.

Get rid of the inAdderClick logic