Try to set up error handling for GitHub Commit plugin

This doesn't really work, but I wanted to hold onto this step. I've been
reading about error handling, notably this article:

http://www.randomhacks.net/2007/03/10/haskell-8-ways-to-report-errors/

I kind of like the idea of just using `fail`, and being able to have
that set up some polymorphism to handle `Maybe`, `Either`, and `IO`
situations, but today read some literature that discouraged using fail,
since not all monads implement it.

Anyway, this code doesn't print out the error string like I intended it
to, so I guess I'll have to use `Either` instead.

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