Changing version number


I am following Robert Nelson eewiki link and using the custom image 4.1.20.bone20 successfully without any issues. Now I wanted to change the version number changed from 4.1.20.bone20 to 1.0.0.
When logged in and checking for uname it should show 1.0.0. We wanted to maintain a internal version number.

Could you pls help and let me know how to change the version number.