Update validate.js to fix jsHint errors.
Update validate.js to fix jsHint errors.

graingert/ui-jq,gdi2290/ui-utils,zhaokunfay/ui-validate,zhaokunfay/ui-validate,r0b-/ui-validate,xml/ui-mask,marbletravis/ui-mask,graingert/ui-utils,saike/ui-mask,angular-ui/ui-scrollpoint,zhaokunfay/ui-event,behzad88/ui-utils,angular-ui/ui-scrollpoint,Queatz/ui-validate,r0b-/ui-validate,lith-light-g/ui-scrollpoint,Queatz/ui-validate,zhaokunfay/ui-scrollpoint,mengshadow/angularjs,xuwupeng2000/ui-event,RafaelTaranto/ui-mask,Mojility/ui-uploader,zhaokunfay/ui-indeterminate,HawkHouseIntegration/ui-mask,akhilshastri/ui-utils,pedroso/ui-mask,modulexcite/ui-utils,angular-ui/ui-event,pedroso/ui-mask,saike/ui-mask,graingert/ui-utils,angular-ui/ui-uploader,graingert/ui-keypress,zhaokunfay/ui-scrollpoint,sndp-vrma/ui-utils,angular-ui/ui-mask,xuwupeng2000/ui-event,angular-ui/ui-indeterminate,angular-ui/ui-utils,zhaokunfay/ui-uploader,sndp-vrma/ui-utils,aniellepizzo/ui-scrollpoint,DexStr/ui-uploader,NickTomlin/ui-mask,DexStr/ui-uploader,isaacplmann/ui-mask,zhaokunfay/ui-mask,aniellepizzo/ui-scrollpoint,mengshadow/angularjs,lukepfeiffer10/ui-mask,NickTomlin/ui-mask,angular-ui/ui-validate,KingMario/ui-uploader,angular-ui/ui-event,zhaokunfay/ui-mask,zhaokunfay/ui-event,lith-light-g/ui-scrollpoint,graingert/ui-keypress,angular-ui/ui-indeterminate,graingert/ui-jq,HawkHouseIntegration/ui-mask,zhaokunfay/ui-indeterminate,RafaelTaranto/ui-mask,KingMario/ui-uploader,marbletravis/ui-mask,isaacplmann/ui-mask,zhaokunfay/ui-uploader,lu4/ui-mask,xml/ui-mask,lukepfeiffer10/ui-mask,Mojility/ui-uploader,lu4/ui-mask