Working with 3.3 of the JS API

Changes:
–removed link to tundra style sheet (3.3 uses a small zoom control by default so no need for the dojo theme to be included since the big slider isn't used)
–upgraded to 3.3
–added dojo.require("esri.layers.graphics"); to d3Layer.js

Background on the third change:  the graphics layer has been around since 1.0. Back then, modules were developed a bit different. Instead of matching the class name, modules were given more generic names and contained several classes. In this case, esri.layers.graphics contains GraphicsLayer as well as a few other supporting classes.