Better examples

[ixjlyons]

I have a couple ideas for better examples.

• Make more examples -- obvious
• Heavily comment examples: AxoPy isn't really designed in a way where complex examples will necessarily flow logically top to bottom, but this could be a nice way to explain some of the tips and tricks. It'd be cool to render them sort of like a jupyter notebook with prose and code blocks interwoven. zetcode (http://zetcode.com/gui/pyqt5/) is an example that I think is pretty effective. I'd rather not manually include blocks of the example code with line numbers.
• Run the examples like tests. I've recently gotten involved in pyqtgraph and I didn't realize they run all the examples with pytest. It's a little complex to set up and there will probably need to be a few improvements to how AxoPy uses the Qt event loop, but it'd be fantastic to automatically run the examples to at least there aren't silly syntax errors and such.