fixed some case-related issues

src/lib/loggers/Stream.js

@@ -12,7 +12,7 @@
 
 module.exports = Stream;
 
-var LoggerAbstract = require('../Logger'),
+var LoggerAbstract = require('../logger'),
   nodeStreams = require('stream'),
   _ = require('../utils'),
   fs = require('fs');

src/lib/loggers/stream.js

@@ -12,7 +12,7 @@
 
 module.exports = Stream;
 
-var LoggerAbstract = require('../Logger'),
+var LoggerAbstract = require('../logger'),
   nodeStreams = require('stream'),
   _ = require('../utils'),
   fs = require('fs');

src/lib/utils.js

@@ -2,7 +2,7 @@ var path = require('path'),
   _ = require('lodash'),
   fs = require('fs'),
   requireDir = require('require-directory'),
-  qs = require('qs'),
+  qs = require('querystring'),
   url = require('url'),
   nodeUtils = require('util');