add css requirejs plugin

apps/css.js

+/**	`css` is a requirejs plugin
+	that loads a css file and inject it into a page.
+	note that this loader will return immediately,
+	regardless of whether the browser had finished parsing the stylesheet.
+	this css loader is implemented for file optimization and depedency managment
+ */
+
+define({
+	load: function (name, require, load, config) {
+		function inject(filename)
+		{
+			var head = document.getElementsByTagName('head')[0];
+			var link = document.createElement('link');
+			link.href = filename;
+			link.rel = 'stylesheet';
+			link.type = 'text/css';
+			head.appendChild(link);
+		}
+		inject(requirejs.toUrl(name));
+		load(true);
+	},
+	pluginBuilder: './css-build'
+});