Added AlwaysValid and AlwaysInvalid validators for mocking and testing purpouses
Added AlwaysValid and AlwaysInvalid validators for mocking and testing purpouses

rogeriopradoj/Validation,maliayas/Validation,riyan8250/Validation,zinovyev/Validation,augustohp/Validation,thedavidmeister/Validation,mta59066/Validation,hudolfhess/Validation,rozehnal/Validation,caferrari/Validation,Ye-Yong-Chi/Validation,mubassirhayat/Validation,jpjoao/Validation,regdos/Validation,solvire/Validation,osiux/Validation,Respect/Validation,ahmetgunes/Validation,Respect/Validation,mrsoto/Validation,lalocespedes/Validation,Whyounes/Validation,guilhermesiani/Validation