variables in include tag with filters

test/source/_posts/2013-12-17-include-variable-filters.markdown

@@ -0,0 +1,22 @@
+---
+title: Post
+layout: post
+include1: include.html
+include2: include
+include3: INCLUDE
+include4: params
+---
+
+Liquid tests
+- 1 {% include {{ page.include1 }} %}
+- 2 {% include {{ page.include2 | append: '.html' }} %}
+- 3 {% include {{ page.include3 | downcase | append: '.html' }} %}
+- 4 {% include {{ page.include2 | append: '.html' }} %} 
+
+Whitespace tests
+- 5 {% include {{page.include1}} %}
+- 6 {% include {{   page.include1}} %}
+- 7 {% include {{  page.include3   | downcase |   append:  '.html'}} %}
+
+Parameters test
+- 8 {% include {{ page.include4 | append: '.html' }} var1='foo' var2='bar' %}