Add more tests
Fix Monad constrat on Bind instances for OptionalT.

Matches tonymorris/course answers.
Fixes #56.
Merge pull request #55 from djv/patch-2

Add more tests
Update instance comment
Add tests for almost all StateT exercises
Merge pull request #59 from djv/patch-4

Add tests for almost all StateT exercises
Fix logging empty string instead of no logging
Remove answers
Merge pull request #60 from djv/patch-5

Fix logging empty string instead of no logging
Merge pull request #61 from djv/patch-6

Remove answers
Merged
Update README.markdown

Added FileIO into list.
Fix tests. Answers for StateT should not be reversed.
Merge branch 'master' of github.com:NICTA/course into abc
Add an extra test for StateT's Apply instance

Catches a potential subtle bug with wrong sequencing of effects.
add note on notReverse
Fix wrong comments
Merge pull request #62 from djv/patch-1

Add an extra test for StateT's Apply instance
Merge pull request #64 from djv/patch-3

Fix wrong comments
Merge in latest from source repository