improve comments in filter class.
improve comments in filter class.

farwish/laravel-pro,zeropingheroes/lanyard,thosakwe/rGuard,pdoren/laravel4,RowlandOti-Student/SlimeApi,zhiyicx/thinksns-plus,kerick-jeff/iPub,remxcode/laravel-base,farwish/laravel-pro,martindilling/martindilling,thosakwe/rGuard,lcp0578/Wiki,cbnuke/FilesCollection,coolguy1990/madrambles,coolguy1990/madrambles,hackel/laravel,tkc/laravel-unit-test-sample,orckid-lab/dashboard,abbasadel/TheGlobalMeter,physio/fatture,lxerxa/actionview,hackel/laravel,GoogleCloudPlatform/laravel,beautifultable/phpwind,renemeza/college-web-control,lxerxa/actionview,superdol/Wiki,renemeza/college-web-control,zeropingheroes/lanyard,renemeza/college-web-control,orckid-lab/dashboard,natetheaverage/Bosspos-dev,xezw211/wx,alanly/soen341-scheduler,chipotle/quill,alanly/soen341-scheduler,SIJOT/SIJOT-2.x,Stolz/Wiki,pdoren/laravel4,udayrockstar/RestaurantManager,resnostyle/Shuttr,slawisha/RestaurantManager,thosakwe/rGuard,Stolz/Wiki,kerick-jeff/iPub,abbasadel/TheGlobalMeter,tkc/laravel-unit-test-sample,udayrockstar/RestaurantManager,ebollens/shib-oauth2-bridge,GoogleCloudPlatform/laravel,slawisha/RestaurantManager,sergi10/rfuerzo,natetheaverage/Bosspos-dev,escanton/invoices-providers,resnostyle/Shuttr,escanton/invoices-providers,tkc/laravel-unit-test-sample,SIJOT/SIJOT-2.x,physio/fatture,coolguy1990/madrambles,chipotle/quill,GoogleCloudPlatform/laravel,martindilling/martindilling,lxerxa/actionview,superdol/Wiki,RowlandOti/SlimeApi,remxcode/laravel-base,flysap/skeleton,beautifultable/phpwind,lcp0578/Wiki,udayrockstar/RestaurantManager,kjvenky/laravel,zhiyicx/thinksns-plus,slimkit/thinksns-plus,coolguy1990/madrambles,xezw211/wx,flysap/skeleton,abbasadel/TheGlobalMeter,chipotle/quill,slimkit/thinksns-plus,ColErr/creepr-workbench,escanton/invoices-providers,alanly/soen341-scheduler,lxerxa/actionview,zeropingheroes/lanyard,ColErr/creepr-workbench,abbasadel/TheGlobalMeter,martindilling/martindilling,xezw211/wx,kerick-jeff/istore,AustinW/contact-manager,alanly/soen341-scheduler,renemeza/college-web-control,tkc/laravel-unit-test-sample,superdol/Wiki,lxyz/laraveldemo,kerick-jeff/iPub,abbasadel/TheGlobalMeter,slawisha/RestaurantManager,kerick-jeff/istore,ucla/shib-oauth2-bridge,tinywitch/laravel,ColErr/creepr-workbench,chipotle/quill,hackel/laravel,sergi10/rfuerzo,AustinW/contact-manager,thosakwe/rGuard,pdoren/laravel4,sergi10/rfuerzo,Stichoza/laravel-boilerplate,boomcms/boomcms,Stolz/Wiki,natetheaverage/Bosspos-dev,kjvenky/laravel,lcp0578/Wiki,AustinW/contact-manager,cbnuke/FilesCollection,natetheaverage/Bosspos-dev,thosakwe/rGuard