Add test case for Person.delete with custom headers.
Add test case for Person.delete with custom headers.

Tests the Person.delete method to make sure any custom headers added to
the class are passed in the request.

eileencodes/activeresource,repinel/activeresource,SweeD/activeresource,yui-knk/activeresource,1776/activeresource,rjordan/activeresource,rails/activeresource,peterjm/activeresource,Shopify/activeresource,wyattisimo/activeresource,maclover7/activeresource,chadzilla2080/activeresource,om-nishu-trantor/activeresource,delameko/activeresource