Added id field to foreign key result

lib/dialects/postgres/query.js

@@ -124,6 +124,7 @@ module.exports = (function() {
         rows.forEach(function(row) {
           var defParts;
           if (row.condef !== undefined && (defParts = row.condef.match(/FOREIGN KEY \((.+){1}\) REFERENCES (.+){1}\((.+){1}\)/))) {
+            row.id = row.constraint_name;
             row.table = defParts[2];
             row.from = defParts[1];
             row.to = defParts[3];