Search - Adding Organizations

As a USER I want to be able to find annotations and groups belonging to organizations that are of particular interest to me.

**Current Search Facet**
The current faceted search does not include organization.

**Proposed Revised Faceted Search**
Includes organization as searchable facet.

**Predictive search on organization**
On entering a keyword for the search facet 'organization:' users are presented with a list of matches.

**Organization level activity page**
On clicking an organization name, the user is taken to an Organization landing page which shows the most recent annotation activity, and groups associated with this organization.


Note: this is an EPIC and will need to be broken down into user stories once we decide on which approach to implement to solve the problem.