Fix connection problem for old PG versions
Fix connection problem for old PG versions

Remove 'application_name' attribute because it was causing connection
problems in old PG versions. Also this attribute was not really used by
sqlectron. It just would make easier for a users know the connection
process source in the server. Since it seems is not used for anyone I
will just remove it for now.

falcon-client/falcon-core,sqlectron/sqlectron-core,falcon-client/falcon-core