added example "image handling"

examples/image-handling/app.js

+var fs        = require("fs")
+  , Sequelize = require("sequelize")
+  , sequelize = new Sequelize('sequelize_test', 'root', null, {logging: false})
+  , Image     = sequelize.define('Image', { data: Sequelize.TEXT })
+
+Image.sync({force: true}).on('success', function() {
+  console.log("reading image")
+  var image = fs.readFileSync(__dirname + '/source.png').toString("base64")
+  console.log("done\n")
+  
+  console.log("creating database entry")
+  Image.create({data: image}).on('success', function(img) {
+    console.log("done\n")
+    
+    console.log("writing file")
+    fs.writeFileSync(__dirname + '/target.png', img.data, "base64")
+    console.log("done\n")
+    
+    console.log("you might open the file ./target.png")
+  })
+})
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