added shy unescape logic

Author: SierraGolf

.gitignore

@@ -4,3 +4,4 @@
 .tmp_*
 node_modules
 coverage
+.idea

helper/htmlEntities.js

@@ -13,7 +13,8 @@ var htmlEntities = {
   gt: '>',
   quot: '"',
   amp: '&',
-  apos: '\''
+  apos: '\'',
+  shy: ''
 };
 
 module.exports = htmlEntities;

tests/unescapeHTML.js

@@ -28,4 +28,5 @@ test('#unescapeHTML', function(){
   equal(unescapeHTML(null), '');
   equal(unescapeHTML(undefined), '');
   equal(unescapeHTML(5), '5');
+  equal(unescapeHTML('­'), '');
 });