Merge pull request #8 in WS/myscriptjs from wip-rest-iink to master

* commit '8caaf2542997c662e2e460819e7b38e459394172': (24 commits)
  [DEV] Improve diagram rest, add missing comments
  [DEV] Make diagram example simpler
  [DEV] Better colors
  [DEV] Change export and preview buttons, mainly style improvements
  [DEV] Fix hmac in rest, better diagram thickness
  [DEV] Change style of color and thickness
  [DEV] Add v1 alert when pointerDown on preview
  [DEV] Improve remove stroke, add redraw from strokes, improve example with existing diagrams
  [DEV] Style for eraser and eraser cursor
  [DEV] Add v1 eraser for diagram rest example
  [DEV] Add rest examples to index page
  [DEV] Improve export panel
  [DEV] Improve export diagram rest to pptx
  [DEV] Improve clear in diagram rest example
  [DEV] Add support for multiple mimetypes in Rest, add export pptx diagram
  [DEV] Change title rest examples, remove language from math
  [DEV] Add katex for math rest example
  [DEV] Change writeEntries to strokeGroups, diagram example fixes
  [DEV] Improve diagram rest example
  [DEV] Change tests structure and mocha tests as apiVersion in renderer are not relevant anymore
  ...

.eslintrc.json

@@ -1,7 +1,7 @@
 {
   "extends": "airbnb",
   "parserOptions": {
-    "ecmaVersion": 6,
+    "ecmaVersion": 2017,
     "sourceType": "module",
     "ecmaFeatures": {
       "jsx": true