Adding SVG version of icons and map for ULS

SVG versions of the icons used in the ULs has been added and
the CSS has been modified so that the png fallback is supported by old browsers.

images/close.svg

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   version="1.1"
+   width="13.591901"
+   height="13.591884"
+   id="svg2">
+  <defs
+     id="defs4" />
+  <metadata
+     id="metadata7">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     transform="translate(-578.6585,-309.30142)"
+     id="layer1">
+    <rect
+       width="3.2036376"
+       height="16.018188"
+       x="188.86241"
+       y="629.48431"
+       transform="matrix(0.70710678,-0.70710678,0.70710678,0.70710678,0,0)"
+       id="rect9372-4-9-5-4-0"
+       style="fill:#555555;fill-opacity:1;stroke:none" />
+    <rect
+       width="3.2036376"
+       height="16.018188"
+       x="-639.09521"
+       y="182.45512"
+       transform="matrix(-0.70710678,-0.70710678,0.70710678,-0.70710678,0,0)"
+       id="rect9372-5-6-44-7-7-7"
+       style="fill:#555555;fill-opacity:1;stroke:none" />
+  </g>
+</svg>