Merge pull request svgdotjs#179 from Shtong/master

Fixed a bug where Element.style() would not save empty values in IE11

Author: Wout Fierens

dist/svg.js

@@ -1279,7 +1279,7 @@
           }
 
         } else {
-          this.node.style[camelCase(s)] = v === null || SVG.regex.isBlank.test(v) ? null : v
+          this.node.style[camelCase(s)] = v === null || SVG.regex.isBlank.test(v) ? '' : v
         }
 
         return this