CDB-3079 simplify installation relying on default postg(res|is)
CDB-3079 simplify installation relying on default postg(res|is)

dbirchak/CartoDB-SQL-API,CartoDB/CartoDB-SQL-API,calvinmetcalf/CartoDB-SQL-API,dbirchak/CartoDB-SQL-API,calvinmetcalf/CartoDB-SQL-API,calvinmetcalf/CartoDB-SQL-API,dbirchak/CartoDB-SQL-API,calvinmetcalf/CartoDB-SQL-API,dbirchak/CartoDB-SQL-API,CartoDB/CartoDB-SQL-API