fix bug in validation unique method.
fix bug in validation unique method.

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