Use #post, and include 'Lookups' in path for creating a lookup

The API docs provided use 'Lookups' as part of the path, and use the POST method.

Author: Daniel Mackey

lib/telapi/carrier.rb

@@ -15,10 +15,10 @@ def list(optional_params = {})
       end
 
       # Returns a Telapi::Carrier object given a phone number
-      # See http://www.telapi.com/docs/api/rest/carrier-services/carrier-lookup/
+      # See http://docs.telapi.com/v2/docs/carrier-lookup
       def lookup(phone_number)
         opts = { :PhoneNumber => phone_number }
-        response = Network.get(['Carrier'], opts)
+        response = Network.post(['Lookups', 'Carrier'], opts)
         Carrier.new(response)
       end