Haskell Trail

[croaky]

Some good ideas in here:

https://app.doxiq.com/d/rbczklzyvgczkfgh/Getting-it-Done-with-Haskell-pdf

/cc @cpytel @jferris @pbrisbin

[pbrisbin]

Those slides are pretty good, I think this is better: https://github.com/bitemyapp/learnhaskell

Either way, getting a Haskell trail sounds great. We already have a few exercises in Upcase too.