chore: tidying up some comments and tests around the new   feature

Closes #141

anchor.js

@@ -237,7 +237,8 @@
       textareaElement.innerHTML = text;
       text = textareaElement.value;
 
-      // Regex for finding the non-safe URL characters (many need escaping): & +$,:;=?@"#{}|^~[`%!'<>]./()*\ (newlines, tabs, backspace, & vertical tabs)
+      // Regex for finding the non-safe URL characters (many need escaping):
+      //   & +$,:;=?@"#{}|^~[`%!'<>]./()*\ (newlines, tabs, backspace, vertical tabs, and non-breaking space)
       var nonsafeChars = /[& +$,:;=?@"#{}|^~[`%!'<>\]\.\/\(\)\*\\\n\t\b\v\u00A0]/g,
           urlText;
 

test/spec/AnchorSpec.js

@@ -376,7 +376,7 @@ describe('AnchorJS', function() {
       var text1Before = 'one&two three+four$five,six:seven;eight=nine?ten',
           text2Before = 'one@two"three#four{five}six|seven^eight~nine[ten',
           text3Before = 'one`two%three!four]five.six/seven(eight)nine*ten',
-          text4Before = 'one\\two<three>four\nfive\tsix\bseven\veight\n\nnine\t\tten',
+          text4Before = 'one\\two<three>four\nfive\tsix\bseven\veight&nbsp;nine\n\nten',
           after = 'one-two-three-four-five-six-seven-eight-nine-ten';
 
       expect(anchors.urlify(text1Before)).toEqual(after);

test/visual-check.html

@@ -81,6 +81,10 @@ <h3>Other languages 追溯到 - അടിത - Загол</h3>
 
       <hr />
 
+      <h3>Non-breaking spaces should not appear in this&nbsp;link</h3>
+
+      <hr />
+
       <h1>Examples of anchors for different length titles</h1>
       <h4>Updating</h4>
       <h4>Updating this project</h4>