Add authentication getter and setter to request context for plugins.

packages/insomnia-app/app/plugins/context/request.js

@@ -131,6 +131,15 @@ export function init(
       }
     },
 
+
+    setAuthentication(name : string, value: string) : void {
+      renderedRequest.authentication[name] = value;
+    },
+
+    getAuthentication() : Object {
+      return renderedRequest.authentication;
+    }
+
     // NOTE: For these to make sense, we'd need to account for cookies in the jar as well
     // addCookie (name: string, value: string): void {}
     // getCookie (name: string): string | null {}
@@ -152,6 +161,7 @@ export function init(
     delete request.setParameter;
     delete request.addParameter;
     delete request.addParameter;
+    delete request.setAuthentication;
   }
 
   return { request };