Compare Flask & Native App Login examples with SDK examples

[rpwagner]

The SDK docs have examples of using Flask and logging in as a Native App. Decide whether to reference these, contribute to them, or if what we're trying to describe or how is different enough that we should have separate examples. Part of that maybe that for Flask we'll use a different library.

[rpwagner]

One note, the primary differentiator is that these examples should be complete, even if they're simple. That is, there should enough code to run a service or execute on the command line. And they can be integrated, e.g., #11 and #12

[lliming]

Please also take a look at the two examples here: https://github.com/lliming/auth-tutorial
I simplified and refocused the examples from the SDK docs to emphasize Auth API features.

[rpwagner]

Those examples are what I've been thinking of. I think we could start with them.