Anonymise some functions to work around Safari bug

Some Safari versions will error with a syntax error if a function has the same name as
one of its parameter.
Found the bug in safari included with iOS 9.3.5.
Fixed for me with this patch.

Author: stribehou

lib/bunyan.js

@@ -1087,7 +1087,7 @@ Logger.prototype.fatal = mkLogEmitter(FATAL);
 Logger.stdSerializers = {};
 
 // Serialize an HTTP request.
-Logger.stdSerializers.req = function req(req) {
+Logger.stdSerializers.req = function (req) {
     if (!req || !req.connection)
         return req;
     return {
@@ -1105,7 +1105,7 @@ Logger.stdSerializers.req = function req(req) {
 };
 
 // Serialize an HTTP response.
-Logger.stdSerializers.res = function res(res) {
+Logger.stdSerializers.res = function (res) {
     if (!res || !res.statusCode)
         return res;
     return {
@@ -1138,7 +1138,7 @@ function getFullErrorStack(ex)
 
 // Serialize an Error object
 // (Core error properties are enumerable in node 0.4, not in 0.6).
-var errSerializer = Logger.stdSerializers.err = function err(err) {
+var errSerializer = Logger.stdSerializers.err = function (err) {
     if (!err || !err.stack)
         return err;
     var obj = {