add some icons and delete demo

icons/codeigniter/codeigniter-plain.svg

@@ -0,0 +1,17 @@
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+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 width="500px" height="500px" viewBox="0 0 500 500" enable-background="new 0 0 500 500" xml:space="preserve">
+<path fill="#EE4323" d="M350.423,190.891c-1.025-0.536-1.917-1.083-2.962-1.617c1.562,3.768,2.069,6.979,2.01,9.848
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