Remove custom predicate stuff from the README. Will move it out to a wiki page
Remove custom predicate stuff from the README. Will move it out to a wiki page

roman-franko/ransack,outstand/ransack,martndemus/ransack,mariorcardoso/ransack,laserlemon/ransack,Mario245/ransack,spectator/ransack,nagyt234/ransack,AndrewSwerlick/ransack,avit/ransack,praktijkindex/ransack,0xCCD/ransack,activerecord-hackery/ransack,johan--/ransack,guilleva/ransack,Eric-Guo/ransack,reinteractive/ransack,amboxer21/ransack,vaski/ransack