Show shared reports in current site, rather than linking back to origin
Tweaks to comment admin and neighbouring reports on detail pages

* Also update readme about how to install
Add category sharing
Skip categories with missing parents - avoids undefined errors
Skip special categories
Don't show category sharing sites in sharing bar.
Refactor category sharing in scheduler to avoid repeated code

Moved bulk of the category save logic into _save_category()
Add support for category translations
Fix install script missing IF NOT EXISTS
Save updated time when syncing categories
Remove pointless count vars
Fix links back to original site
Copy category position from main site too
Always set categories visible
Refactoring to fix the /reports map

* No longer overriding json::geojson()
  Use events instead and grab markers with fetch_incidents()
* Apply tweaks to fetch_incidents() for /json too
* Always treat sharing param as an array
* Use events to tweak marker color and url.
* Sharing model supports incident_id in object not just id
Hide categories when they're not returned in API call, don't delete.
Fix reports listing view for Ushahidi 2.6