flatiron/winston — pull request #410 by pradeep-mishra (2014-06-22 16:22:04+00:00)
Title: levels filter added for query on file transport

query on file transport by levels

eg:

```Javascript
var winston = require('winston');
var logger = new (winston.Logger)({
transports: [
new (winston.transports.File)({ filename: 'logfile.log' })
]
});

logger.query({
levels : ['info', 'warn']
},function (err, results) {
if (err) {
throw err;
}
console.log(results);
});

```