felixge/node-mysql — pull request #802 by shlee322 (2014-04-27 15:37:34+00:00)
Title: add Warning Full Connection Pool (event)

Sometimes 'pool' is used without calling 'release', which is hard to detect.
By adding 'warningFullConnectionPool', developer can find unreleased pool with ease.

```
pool = mysql.createPool({
....
warningFullConnectionPool : true
});
pool.on('warningFullConnectionPool', function(e) {
console.warn(e);
});
````