Added Address.same() function
Added address-selection directive
Added address-selection to checkout view
Updated checkout controller to use `Account.user`
Fixed bug in address-selection when `addresses` is initially empty
Updated logic to determine if using existing address in address-selection directive
Added toggleExsitingAddress() to address-selection
Added Address.shortAddress()
Added Address.addressLine()
Updated address-selection view to use toggleExistingAddress() function
Updated ng-options for address selection
Initialize $scope.address when switching to existing address mode
Updated address-selection to use existing address on initializing
Wrapped existing/new address links in p tag
Added link to card verification code article on wikipedia
Updated address-selection to clear address when switching to existing address mode
Added info about secure transaction when ssl enabled
Updated security check to skip checking for string ending with colon
Updated copy in readme
Refactored Account service to remove wallet