Adding Android Developers Google+ redirect

Redirect developer.android.com/+ to Google+ page for Android Developers.

Issue: 5933956

Change-Id: I0ed2b076386058f1ac81ea4376aea15fee6b24aa

scripts/app_engine_server/redirects.yaml

@@ -49,3 +49,7 @@
 #
 
 redirects:
+- src: /%2B/?$
+  dst: https://plus.google.com/b/108967384991768947849/
+  type: permanent
+  comment: Redirect /+ and /+/ to Google+