Issue #281
Merge pull request #282 from orionll/patch-1

Issue #281
Also hide scala std lib Some, None, Right and Left
Merge pull request #283 from OleTraveler/hide-stdlib

Also hide scala std lib Some, None, Right and Left
Fixed syntax
Merge pull request #287 from AlexanderDaniel/answerkey_monad_exercise6

Fixed syntax in answer key for monads exercise 6
Merge remote-tracking branch 'upstream/master'