Add citation to the annotation cards
Only show the citation on the standalone annotation

This fixes #1390. A new controller for the standalone annotation
allows us to determine how to render the annotation and this information
is passed down to the AnnotationController via a combination of scope
properties and attributes.

There are now two distinct states for an annotation, either embedded in
which the annotation is rendered on top of the original document or
standalone, where it appears separately from its document.
Fix partial comment for extractURIComponent

[no ci]
Merge pull request #1423 from hypothesis/1390-add-citation-to-annotation-card

Add the citation back into the annotation card