Merge branch 'master' into answers
announcement notes
oops
migrated the tests to specs2
Merge pull request #13 from etorreborre/master

Migrated the tests to specs2
add IO instances
Merge branch 'master' into answers
fill out missing answers -- why were the missing?
fill out missing answers -- why were the missing?
update scalaz version
Merge branch 'master' into answers
Merge branch 'answers' into answers-nodeps
tidy answers
Merge branch 'answers' into answers-nodeps
introduce interactive exercise
Merge branch 'master' into answers
answers for interactive exercises
Merge branch 'answers' into answers-nodeps
add Id to exported modules
Merge branch 'master' into answers