Remove dependency on RequireJS 1.x since Brackets is moving to 2.1.

Use the standard Brackets utility function to load CSS instead of relying
on require.nameToUrl(), which has been removed in Require 2.x.

main.js

@@ -43,6 +43,7 @@ define(function (require, exports, module) {
         Menus          = brackets.getModule("command/Menus"),
         Dialogs		   = brackets.getModule("widgets/Dialogs"),
         FileUtils      = brackets.getModule("file/FileUtils"),
+        ExtensionUtils = brackets.getModule("utils/ExtensionUtils"),
 		eve,
 		format         = (function () {
 		    var tokenRegex = /\{([^\}]+)\}/g,
@@ -83,9 +84,7 @@ define(function (require, exports, module) {
 	    var PGB_COMMAND_ID = "phonegap.build";   // package-style naming to avoid collisions
 	    CommandManager.register(Strings.COMMAND_NAME, PGB_COMMAND_ID, eve.f("pgb.button.click"));
 
-		var button = $("<a>"),
-			path2 = require.nameToUrl("icon.svg");
-		path2 = path2.substring(0, path2.indexOf("icon.svg["));
+		var button = $("<a>");
 
 		function zipProject(id) {
 			var rootPath = ProjectManager.getProjectRoot().fullPath,
@@ -221,14 +220,15 @@ define(function (require, exports, module) {
 		        xhr.send(form);
 	    	}	
 		}
-
+
+		ExtensionUtils.loadStyleSheet(module, "pgb.css");
+
 		button.attr({
 			title: Strings.COMMAND_NAME,
 			id: "pgb-btn",
 			href: "#",
 			"class": "disabled"
-		}).html('<link rel="stylesheet" href="' + path2 + 'pgb.css">')
-		.click(eve.f("pgb.button.click"));
+		}).click(eve.f("pgb.button.click"));
 		button.insertAfter("#toolbar-go-live");
 
 		var $panel = $('<div id="pgb-panel" class="bottom-panel">\