fix(jqLite): data should store data only on Element and Document nodes

This is what jQuery does by default: https://github.com/jquery/jquery/blob/c18c6229c84cd2f0c9fe9f6fc3749e2c93608cc7/src/data/accepts.js#L16

We don't need to set data on text/comment nodes internally and if we don't
allow setting data on these nodes, we don't need to worry about cleaning
it up.

BREAKING CHANGE: previously it was possible to set jqLite data on Text/Comment
nodes, but now that is allowed only on Element and Document nodes just like in
jQuery. We don't expect that app code actually depends on this accidental feature.

Author: IgorMinar

src/jqLite.js

@@ -316,7 +316,10 @@ function jqLiteData(element, key, value) {
   }
 
   if (isSetter) {
-    data[key] = value;
+    // set data only on Elements and Documents
+    if (element.nodeType === 1 || element.nodeType === 9) {
+      data[key] = value;
+    }
   } else {
     if (keyDefined) {
       if (isSimpleGetter) {