pg: remove the useless connection string

lib/dialects/postgres/connection-manager.js

@@ -19,11 +19,30 @@ ConnectionManager = function(dialect, sequelize) {
 Utils._.extend(ConnectionManager.prototype, AbstractConnectionManager.prototype);
 
 ConnectionManager.prototype.connect = function(config) {
-  var self = this;
+  var self = this
+    , pg_config = {};
+
+  config.user = config.username;
+  pg_config = Utils._.pick(config, [
+    'user', 'database', 'port', 'host', 'password',
+    // see [http://www.postgresql.org/docs/9.3/static/runtime-config-logging.html#GUC-APPLICATION-NAME]
+    'application_name',
+    // choose the SSL mode with the PGSSLMODE environment variable
+    // object format: [https://github.com/brianc/node-postgres/blob/master/lib/connection.js#L79]
+    // see also [http://www.postgresql.org/docs/9.3/static/libpq-ssl.html]
+    'ssl', 
+    // In addition to the values accepted by the corresponding server,
+    // you can use "auto" to determine the right encoding from the
+    // current locale in the client (LC_CTYPE environment variable on Unix systems)
+    'client_encoding',
+    // !! DONT SET THIS TO TRUE !!
+    // (unless you know what you're doing)
+    // see [http://www.postgresql.org/message-id/flat/bc9549a50706040852u27633f41ib1e6b09f8339d845@mail.gmail.com#bc9549a50706040852u27633f41ib1e6b09f8339d845@mail.gmail.com]
+    'binary'
+  ]);
 
   return new Promise(function (resolve, reject) {
-    var connectionString = self.sequelize.getQueryInterface().QueryGenerator.databaseConnectionUri(config)
-      , connection = new self.lib.Client(connectionString)
+    var connection = new self.lib.Client(pg_config)
       , responded = false;
 
     connection.connect(function(err) {