Send and receive oauthProxy in REST routes

Part of #6

src/routes/apps.js

@@ -54,7 +54,8 @@ function removeInternalAppFields(app) {
         fqdn: app.fqdn,
         memoryLimit: app.memoryLimit,
         altDomain: app.altDomain,
-        xFrameOptions: app.xFrameOptions
+        xFrameOptions: app.xFrameOptions,
+        oauthProxy: app.oauthProxy
     };
 }