move the query for all incidents to the controller
Tidy up the display of number and timing of available incidents

* Add class method for important dates
* Add helper method to display dates
* Support empty database
Group class methods
add counter cache to locations incidents_count
cleanup
move calculation logic to the incident controller
add a table listing all locations and their count of incident reports
remove :target highlighting
compile
Merge pull request #28 from henare/topic-aboutincidents--locations

Incidents number and timing tidy up
Merge branch 'topic-aboutincidents--locations' of github.com:equivalentideas/detentionlogs into topic-aboutincidents--locations

Conflicts:
	app/controllers/incidents_controller.rb
	app/views/incidents/about.html.erb
Merge branch 'refs/heads/Development' into topic-aboutincidents--locations

Conflicts:
	app/views/home/frontpage.html.erb
update date call