Merge branch 'release/1.4.4' into production

lib/mysql.js

@@ -1203,5 +1203,9 @@ MySQL.prototype.disconnect = function () {
   }
 };
 
+MySQL.prototype.ping = function(cb) {
+  this.query('SELECT 1 AS result', cb);
+};
+
 require('./discovery')(MySQL);
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "loopback-connector-mysql",
-  "version": "1.4.3",
+  "version": "1.4.4",
   "description": "MySQL connector for loopback-datasource-juggler",
   "main": "index.js",
   "scripts": {