typos, formatting improvements, attempt to make figure linewidth relative to overall image size (failed)
images, plus animated example
Merge pull request #17 from jywarren/master

typos, formatting improvements, attempt to make figure linewidth...

Ah, right -- I'm still a bit new to git, so I hope I don't goof up the process.  I'll dig into one of these new features soon, and see if I can get the workflow down ...