Added more tests for nested validation
Added more tests for nested validation

Contagious06/backbone.validation,Wealthymaury/backbone.validation,loveholidays/backbone.validation,gmmorris/backbone.validation,benmccormick/backbone.validation,fragsalat/backbone.validation.async,CodexLabs/backbone.validation,tjaartvdwalt/backbone.validation,nickryall/backbone.validation,thedersen/backbone.validation,SimenB/backbone.validation