PostgreSQL replication to Amazon RDS
Replication using trigger-based systems like Londiste and Bucardo into and out of RDS is now supported as of Nov. 10th 2014, per a reply on that forum thread.
Announcement here
I think it is not possible. SImilar functionality is available for MySQL RDS: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/MySQL.Procedural.Importing.NonRDSRepl.html
However, the closest for PostgreSQL RDS that I could find is: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/PostgreSQL.Procedural.Importing.html
Check on AWS Forum for better thoughts around this: https://forums.aws.amazon.com/index.jspa