Modified the views in people_equipment to add Total inline

Also removed make, models from index_people_equipment to include name
and a link to show

Cleaned up the shows for people and possession contracts

Added helpers to aggregate possession contracts owned by people

modified schema to abstract out payment on possession_contracts with
getters setters
findal helper modifications
modified all the redirects for new and edit in all controllers.

added root_path in routes
changed possession_contract to have unique equipment association

fixed all the broken Equipment.new instead of the correct
Equipment.create in all the tests
Final dropdown changes