Add pyoutline examples for widely used apps

[erikstrauss]

OpenCue/pyoutline/tutorials/example/example.py gives an architectural view of how outline works, but it would be very helpful for people new to the code to see practical examples of outline files using common 3rd party packages like Nuke and Maya. This would tie the functions described to use cases in the wild and lower the barrier to understanding conceptually what Open Cue expects as an input.

[bcipriano]

Note from https://github.com/imageworks/OpenCue/issues/301 that there is an existing file that we can probably use or build on in some form.

https://github.com/imageworks/OpenCue/blob/master/pyoutline/tutorials/tutorial.html