Subscribe to notification before emitting connected

Fixes a case where you connect & immediatley disconnect and _sometimes_ your notification subscription starts the reader on the libpq instance after the libpq instance is disconnected.  This segfaults the app.

Author: brianc

lib/native/index.js

@@ -51,8 +51,6 @@ Client.prototype.connect = function(cb) {
 
       //set internal states to connected
       self._connected = true;
-      self.emit('connect');
-      self._pulseQueryQueue(true);
 
       //handle connection errors from the native layer
       self.native.on('error', function(err) {
@@ -70,6 +68,10 @@ Client.prototype.connect = function(cb) {
         });
       });
 
+      //signal we are connected now
+      self.emit('connect');
+      self._pulseQueryQueue(true);
+
       //possibly call the optional callback
       if(cb) cb();
     });