Fixed DataContextBinder Exceptions. Added binding support for NGUI UICheckbox and UIInput.

Fixed DataContextBinder exceptions. Added binding support for NGUI's UICheckbox and UIInput.  I also added a new item to the Main Menu called 'Character Config' which demonstrates the use of DataContextBinder, UICheckbox binding, and UIInput binding.

FYI -- I am working with Unity 4.1.5.