Adding two examples

This is rough, but I opened this up as a place for discussion. In addition, it is not working 100% yet. In the first example, the last statement (`commit_on_success("target2") {...` fails with 

    java.lang.RuntimeException: [SQLITE_ERROR] SQL error or missing database (cannot commit - no transaction is active)

I am not sure why, I would like to walk through and see what I am doing wrong.

The presidents xml file can be found here, it would need to be added to the tutorial package: https://gist.github.com/jeffmax/ceed8ec555acb9208ec0