Feature: Added Links for Events as Suggested by @mariekythe2

Added also example to showcase how to use the new Links in events
Also updated README.md for Event Format

Resolves issue #19

Author: nizarmah

README.md

@@ -167,7 +167,8 @@ var organizer = new Organizer("organizerContainer", // Organizer container id
 {
     startTime: "00:00",
     endTime: "24:00",
-    text: "Christmas Day"
+    text: "Christmas Day",
+    link: "https://github.com/nizarmah" // this is optional :)
 }
 ```
 > Since starting and ending time are strings, 24 hour time is not required. You can just use "12:00am" and "12:00pm" instead of "00:00" and "24:00"

calendarorganizer.js

@@ -508,7 +508,19 @@ Organizer.prototype.list = function (data) {
 
         var paragraph = document.createElement("P");
         paragraph.id = this.id + "-list-item-" + i + "-text";
-        paragraph.appendChild(document.createTextNode(data[i].text));
+
+        var textNode = document.createTextNode(data[i].text);
+         if (data[i].link == undefined || data[i].link == "") {
+            paragraph.appendChild(textNode);
+        } else {
+            var link = document.createElement("A");
+            link.href = data[i].link;
+            link.target = "_blank";
+            link.class = this.id + " link";
+            link.appendChild(textNode);
+
+            paragraph.appendChild(link);
+        }
 
         listItem.appendChild(division);
         listItem.appendChild(paragraph);