Add use strict statements

This is going to improve the performance minimal and improves the safety of the code

Author: Ruben Bridgewater

benches/buffer_bench.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var source = new Buffer(100),
     dest = new Buffer(100), i, j, k, tmp, count = 1000000, bytes = 100;
 

benches/hiredis_parser.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var Parser = require('../lib/parser/hiredis').Parser;
 var assert = require('assert');
 

benches/re_sub_test.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var client = require('../index').createClient()
   , client2 = require('../index').createClient()
   , assert = require('assert');

benches/reconnect_test.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var redis = require("../index").createClient(null, null, {
 //    max_attempts: 4
 });

benches/stress/codec.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var json = {
 	encode: JSON.stringify,
 	decode: JSON.parse

benches/stress/speed/speed.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var msgpack = require('node-msgpack');
 var bison = require('bison');
 var codec = {

benches/sub_quit_test.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var client = require("redis").createClient(),
     client2 = require("redis").createClient();
 

connection_breaker.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var net = require('net');
 
 var proxyPort = 6379;

diff_multi_bench_output.js

@@ -1,5 +1,7 @@
 #!/usr/bin/env node
 
+'use strict';
+
 var colors = require('colors'),
     fs = require('fs'),
     _ = require('underscore'),

examples/auth.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var redis  = require("redis"),
     client = redis.createClient();