Revert "Merge branch 'master' of git://github.com/keeyip/backgrid-filter into keeyip-master"

This reverts commit f8ac4feb545406f3788c7e0bb6c7f51f1f65d96a, reversing
changes made to 408f4f7d853a02c7fe30d91c152ed49228f40411.

Conflicts:
	AbstractFilter.js
Remove requireOptions again