Migrate command-based examples to this repo

[virtuald]

I'm going to consolidate all of the RobotPy example programs into a single repository to make it easier to navigate and discover them. Currently there are two command-based examples (in addition to pacgoat and gearsbot). It would be good to fix the examples to reflect the best way to create a command based robot.

• https://github.com/robotpy/robotpy-wpilib/tree/2016/examples/command-based
• https://github.com/robotpy/robotpy-wpilib-utilities/tree/master/samples/command_based

@FRC2539 can you merge the two examples (or create separate examples) and make a PR to this repo with it? Thanks!