Revert escaping of underscore characater from #171
Revert escaping of underscore characater from #171

Related to #176

vaski/ransack,avit/ransack,Eric-Guo/ransack,laserlemon/ransack,guilleva/ransack,nagyt234/ransack,outstand/ransack,amboxer21/ransack,reinteractive/ransack,johan--/ransack,mariorcardoso/ransack,spectator/ransack,Mario245/ransack,martndemus/ransack,roman-franko/ransack,praktijkindex/ransack,activerecord-hackery/ransack,AndrewSwerlick/ransack