- Fix: Save broken on Firefox (since FF version?)

- Docs: Mention potentially more frequent release schedule
- Docs (ReleaseInstructions): Update per new testing; update
  `grep-doc` -> `types-doc` and indicate current failing status; indicate
  when `build-doc` will be used; clarify `npm pack`
- npm: Add newly renamed `jsdoc-check-overly-generic-types.js` to ignore
- npm: Bump to 3.1.1

package.json

@@ -1,6 +1,6 @@
 {
   "name": "svgedit",
-  "version": "3.1.0",
+  "version": "3.1.1",
   "description": "Powerful SVG-Editor for your browser ",
   "main": "dist/index-umd.js",
   "module": "dist/index-es.js",