Add links to Plunkr and test suite

Author: mar10

.github/CONTRIBUTING.md

@@ -1,4 +1,4 @@
-Thanks for contributing :-)
+Thanks for contributing :+1:
 
-In lieu of a own guideline, please have a look at the 
+In lieu of an own guideline, please have a look at the 
 [Fancytree Contributing Guidelines](https://github.com/mar10/fancytree/wiki/HowtoContribute#report-issues).

.github/ISSUE_TEMPLATE.md

@@ -21,5 +21,4 @@ Plunker (http://plnkr.co/edit/Bbcoqy?p=preview) ?
 
   - Browser type and version:
   - jQuery and jQuery UI versions:
-  - Fancytree version:    
-    enabled/affected extensions: 
+  - ui-contextmenu version:    

CHANGELOG.md

@@ -1,4 +1,4 @@
-# 1.12.1-0 / Unreleased
+# 1.13.0-0 / Unreleased
 
  * [FEATURE] Test with jQuery 3
  * [FEATURE] #104 Allow to pass mouse click events to `open()`

README.md

@@ -26,6 +26,14 @@ See also the [Change Log](https://github.com/mar10/jquery-ui-contextmenu/blob/ma
 [Live demo page](http://wwwendt.de/tech/demo/jquery-contextmenu/demo/):<br>
 [ ![sample](demo/teaser.png?raw=true) ](http://wwwendt.de/tech/demo/jquery-contextmenu/demo/ "Live demo")
 
+See also the unit tests and live examples 
+
+**More:**
+
+  * Play with [jsFiddle](http://jsfiddle.net/mar10/6o3u8a88/) or 
+    [Plunker](http://plnkr.co/edit/Bbcoqy?p=preview)
+  * Run the [unit tests](http://rawgit.com/mar10/jquery-ui-contextmenu/master/test/index.html).
+
 
 ## Getting Started