Implement all logic on the client side in csvxmlV2.js

For completing the rewrite, translations and some UI work are still
needed.

See #14

public/assets/js/jszip/.gitignore

@@ -0,0 +1,7 @@
+_site
+.c9revisions
+.DS_Store
+.jekyll-metadata
+*~
+node_modules
+sauce_connect.log