Log Message:
Update ruby-liquid to 2.4.1.

# Liquid Version History

## 2.4.0 / 2012-08-03

* Performance improvements
* Allow filters in `assign`
* Add `modulo` filter
* Ruby 1.8, 1.9, and Rubinius compatibility fixes
* Add support for `quoted['references']` in `tablerow`
* Add support for Enumerable to `tablerow`
* `strip_html` filter removes html comments