Add the test for masks

Author: eGavr

test/diff/fixtures/first/mask.html

@@ -0,0 +1,2 @@
+AZ<meta charset="UTF-32">
+<div id="blah{{\d+}}blah"></div>bl{{\}}{=ah 5

test/diff/fixtures/second/mask.html

@@ -0,0 +1,2 @@
+{{[A-Z]+}}<meta charset="{{UTF-\d{1,2}}}">
+<div id="blah12345blah"></div>{{bl\{\{\\\}}{=ah\s\d}}

test/diff/isEqual.js

@@ -136,4 +136,11 @@ describe('\'isEqual\'', function () {
 
         htmlDiffer.isEqual(files.html1, files.html2).must.be.true();
     });
+
+    it('must work mask {{RegExp}}', function () {
+        var htmlDiffer = new HtmlDiffer(),
+            files = readFiles('mask');
+
+        htmlDiffer.isEqual(files.html1, files.html2).must.be.true();
+    });
 });