Update example build_config to include host build setting

By this changes,
- File name indicate it is build_config file more clearly.
- Include host build setting, to make trying easy( I saw some people confused and missed host build setting on cross build environment. Of course developer should consult documents, but I think it would be better to make examples more practical).

Also, I made below small changes.
- Change cross build name from "Arduino Due" to "ArduinoDue" for avoid build dir including space. 
- Fix cross build name from "chipKitMax32" to "chipKITMax32".