Accept 'postgres' as a PostgreSQL driver name in dbconsole for non-AR ORMs like DataMapper and Sequel

[#6180 state:committed]

Signed-off-by: Santiago Pastorino <santiago@wyeworks.com>

railties/lib/rails/commands/dbconsole.rb

@@ -80,7 +80,7 @@ module Rails
 
         exec(find_cmd('mysql', 'mysql5'), *args)
 
-      when "postgresql"
+      when "postgresql", "postgres"
         ENV['PGUSER']     = config["username"] if config["username"]
         ENV['PGHOST']     = config["host"] if config["host"]
         ENV['PGPORT']     = config["port"].to_s if config["port"]