Create a rudimentary global hits page

* Show top errors, archives and redirects across all sites
Create categories for global hits

* See top errors, archives and redirects across all sites
* Defaults to last 30 days
Include time period drop down on global hits
Rename global to universal
Link to universal analytics

* From the main navigation bar, removing the redundant Organisations
link
* From the site dashboard, beneath site analytics
Indicate organisation responsible for global hit

* Include a link to a hit’s site using organisation name
* Remove actions column
* Add a link to the analytics for that site
Improve muted-link hover styles

* Currently an inconsistency between visited and normal links, one
stays grey, one goes blue
* Now they both go a darker gray
Group by host_id in universal analytics

* When /a comes from two different hosts we need to show them as
separate entries in the global hits view
* Include host_id in the grouping
Create universal analytics feature

* Try and factor out some of the magic numbers in hits assertions,
define what we expect when setting the hits data
* Base feature on hits_summary
Include links to see more beneath top 10
Fix no content message for global categories
Refactor linking to hits

* A hit model can now provide a default URL (based on the default host)
* link_to_global_hit was poorly named
Rename global to universal

* Re-use existing hits partials where sensible
* Avoid “global”, use “universal”
Clarify hits controller filters
Only show analytics links to admins

After discussions with Dave Mann about who this feature is for, to
avoid confusion and to mitigate the risk that HMRC will have on this
feature, the navigation and site links have been removed.
Be clearer about hit site links

* Don’t link to site from organisation, because that’s confusing
* Use the text “Site” to link to site, with hostname as a title
Exclude universal pages from bulk add message
Merge pull request #259 from alphagov/global-hits

Universal analytics