Add use strict statements

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

examples/auth.js

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

examples/backpressure_drain.js

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

examples/eval.js

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

examples/extend.js

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

examples/file.js

@@ -1,3 +1,5 @@
+'use strict';
+
 // Read a file from disk, store it in Redis, then read it back from Redis.
 
 var redis = require("redis"),

examples/mget.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var client = require("redis").createClient();
 
 client.mget(["sessions started", "sessions started", "foo"], function (err, res) {

examples/monitor.js

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

examples/multi.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var redis  = require("redis"),
     client = redis.createClient(), set_size = 20;
 

examples/multi2.js

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

examples/psubscribe.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var redis = require("redis"),
     client1 = redis.createClient(),
     client2 = redis.createClient(),

examples/pub_sub.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var redis = require("redis"),
     client1 = redis.createClient(), msg_count = 0,
     client2 = redis.createClient();

examples/scan.js

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

examples/simple.js

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

examples/sort.js

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

examples/subqueries.js

@@ -1,3 +1,5 @@
+'use strict';
+
 // Sending commands in response to other commands.
 // This example runs "type" against every key in the database
 //

examples/subquery.js

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

examples/web_server.js

@@ -1,3 +1,5 @@
+'use strict';
+
 // A simple web server that generates dyanmic content based on responses from Redis
 
 var http = require("http"), server,
@@ -7,9 +9,9 @@ server = http.createServer(function (request, response) {
     response.writeHead(200, {
         "Content-Type": "text/plain"
     });
-    
+
     var redis_info, total_requests;
-    
+
     redis_client.info(function (err, reply) {
         redis_info = reply; // stash response in outer scope
     });