test: add multi includes, issue #18

Author: Scrum

test/includes/1.html

@@ -0,0 +1,2 @@
+<h2>1</h2>
+<include src="./includes/2.html"></include>

test/includes/2.html

@@ -0,0 +1 @@
+<h2>2</h2>

test/test.js

@@ -34,6 +34,15 @@ describe('Simple test', function() {
         );
     });
 
+    it('multi includes', function(done) {
+        test(
+            '<h1>index</h1><include src="./includes/1.html"></include>',
+            '<h1>index</h1><h2>1</h2>\n<h2>2</h2>',
+            { root: './test/' },
+            done
+        );
+    });
+
     it('addDependencyTo option', function(done) {
         var includePath = require('path').resolve('./test/blocks/button/button.html');