Brson's "someday" list

[brson]

@japaric

I've been working on something like this. Basically, docker + travis + appveyor to test as many (cross) targets as possible. The repository is here. So far I count a test coverage of 21 of 49 targets.

@japaric Yay, this is exactly what I was hoping for! Do you know why so many targets are red (and why the badge says the build is passing)? I updated the op to link to your project.