Add card api

Author: kevinresol

src/stripe/api/CardApi.hx

@@ -0,0 +1,10 @@
+package stripe.api;
+
+import stripe.types.*;
+
+interface CardApi {
+	
+	@:get('/')
+	public function get():Card;
+	
+}

src/stripe/api/CardsApi.hx

@@ -4,6 +4,9 @@ import stripe.types.*;
 
 interface CardsApi {
 
+	@:sub('/$id')
+	function ofId(id:String):CardApi;
+	
 	@:post('/')
 	@:consumes('application/x-www-form-urlencoded')
 	public function create(body:{

src/stripe/api/CustomersApi.hx

@@ -10,7 +10,7 @@ interface CustomersApi {
 	@:get('/')
 	@:consumes('application/x-www-form-urlencoded')
 	function list(query:{
-		?created:Date, // timestamp
+		?created:Timestamp,
 		?ending_before:String,
 		?starting_after:String,
 		?limit:Int,