Fix a regression in tablerow limit parameter.

I had accidentally read slice_collection_using_each as using to as an
inclusive limit rather than exclusive, and no tests covered the offset or
limit parameters.

test/liquid/tags/html_tag_test.rb

@@ -54,4 +54,10 @@ class HtmlTagTest < Test::Unit::TestCase
                            '{% tablerow n in numbers cols:3%} {{n}} {% endtablerow %}',
                            'numbers' => ArrayDrop.new([1,2,3,4,5,6]))
   end
+
+  def test_offset_and_limit
+    assert_template_result("<tr class=\"row1\">\n<td class=\"col1\"> 1 </td><td class=\"col2\"> 2 </td><td class=\"col3\"> 3 </td></tr>\n<tr class=\"row2\"><td class=\"col1\"> 4 </td><td class=\"col2\"> 5 </td><td class=\"col3\"> 6 </td></tr>\n",
+                           '{% tablerow n in numbers cols:3 offset:1 limit:6%} {{n}} {% endtablerow %}',
+                           'numbers' => [0,1,2,3,4,5,6,7])
+  end
 end # HtmlTagTest