Closes #238 Updated async library in order to use lib in —use-strict mode

lib/appenders/dateFile.js

@@ -56,7 +56,7 @@ function configure(config, options) {
 }
 
 function shutdown(cb) {
-  async.forEach(openFiles, function(file, done) {
+  async.each(openFiles, function(file, done) {
     if (!file.write(eol, "utf-8")) {
       file.once('drain', function() {
         file.end(done);

lib/appenders/file.js

@@ -80,7 +80,7 @@ function configure(config, options) {
 }
 
 function shutdown(cb) {
-  async.forEach(openFiles, function(file, done) {
+  async.each(openFiles, function(file, done) {
     if (!file.write(eol, "utf-8")) {
       file.once('drain', function() {
         file.end(done);

lib/log4js.js

@@ -388,7 +388,7 @@ function shutdown(cb) {
     }, []);
 
   // Call each of the shutdown functions.
-  async.forEach(
+  async.each(
     shutdownFunctions,
     function(shutdownFn, done) {
       shutdownFn(done);

lib/streams/RollingFileStream.js

@@ -71,7 +71,7 @@ RollingFileStream.prototype.roll = function(filename, callback) {
     //roll the backups (rename file.n to file.n+1, where n <= numBackups)
     debug("Renaming the old files");
     fs.readdir(path.dirname(filename), function (err, files) {
-      async.forEachSeries(
+      async.eachSeries(
         files.filter(justTheseFiles).sort(byIndex).reverse(),
         increaseFileIndex,
         cb