Added a death model, and all associated behavior
That includes:
 Associated it with a person
 Associated a place with it
 Added some helper functions to person
 Added functionality to the person controller
 Added fields to the new/edit person form
 Added text to the person show page
Merge branch 'death'

Conflicts:
	app/models/person.rb
Moved the cucumber-rails-training-wheels gem into the test environment
Fixed a typo in the navigation dropdown