fix # issues for SVGs

Closes #640

components/Editor.js

@@ -180,7 +180,13 @@ class Editor extends React.Component {
           return (
             domtoimage
               .toSvg(node, config)
-              .then(dataUrl => dataUrl.replace(/ /g, ' '))
+              .then(dataUrl =>
+                dataUrl
+                  .replace(/ /g, ' ')
+                  // https://github.com/tsayen/dom-to-image/blob/fae625bce0970b3a039671ea7f338d05ecb3d0e8/src/dom-to-image.js#L551
+                  .replace(/%23/g, '#')
+                  .replace(/%0A/, '\n')
+              )
               // https://stackoverflow.com/questions/7604436/xmlparseentityref-no-name-warnings-while-loading-xml-into-a-php-file
               .then(dataUrl => dataUrl.replace(/&(?!#?[a-z0-9]+;)/g, '&'))
               .then(uri => uri.slice(uri.indexOf(',') + 1))