Added new properties that can be used during strinigification
Added new properties that can be used during strinigification

ck-lee/joi,geminiyellow/joi,pikselpalette/joi,jeffbski/joi,tpiecora/joi,jagoda/joi,rmoorman/joi,olistic/joi-extended,bananaoomarang/joi,opyate/joi,danielb2/joi,robertherber/joi-extended,thethanghn/react-native-joi,lloydbenson/joi,davidbenko9/joi,cesarmarinhorj/joi,naitsric/joi,pandeysoni/joi