* Add isScopedToUri property based on group scope

CombinedGroups now takes into account the scoping of groups and adds
an isScopedToUri property to each group indicating whether is can be
annotated in at the provided uri based on its defined scope.

* Provide scope info and page's uri to combineGroups

Get the scope info for each group by passing expand: scopes in the group
api requests. Pass the documentUri to the CombineGroup function as it needs
this in order to determine which groups are scoped to the page's uri.

* Remove endefined checking logic