Secrets iteration:

- added delete http verb to system/secrets
- added secrets request type
- added vagrant env provisioned by existing deploy_stack.sh

Signed-off-by: Andrew Cornies <acornies@gmail.com>

gateway/requests/requests.go

@@ -90,3 +90,8 @@ type AsyncReport struct {
 type DeleteFunctionRequest struct {
 	FunctionName string `json:"functionName"`
 }
+
+// SecretRequest create, update a secret
+type SecretRequest struct {
+	Secrets *map[string]string `json:"secrets"`
+}