reread stuff about this, do a simple example
add refs, note about adapting tuples
read, write explanation, stupid example
add disjunction biased version, stupid conversion
remove outdated comment
uh oh docs
add tests for errors
clarify comment re Scalaz
Some :nail_care: for the error-handling code
Merge branch 'howto/handle/errors'
Merge branch 'master' of github.com:ohnosequences/scala-guide