Move MonadCatch to its proper namespace directory
(in project exercisses)
Merge pull request #298 from newlandsvalley/master

Move MonadCatch to its proper namespace directory
Remove out-of-date iomonad answers
Merge pull request #300 from newlandsvalley/master

Remove out-of-date iomonad answers
Solution for Exercise 11.6
Merge pull request #302 from salmonsushi/master

Solution for Exercise 11.6
Update Monad.scala
fixed factor signature for applicative exercises
Omit an optional type variable of the Stream.filter method.

The type variable [B] of the fpinscala.lazyness.Stream.filter method
can be omitted.
Add .idea the intellij project directory to .gitignore.
Merge pull request #314 from HappyRay/master

Add .idea the intellij project directory to .gitignore.
Add answer/hint for Chapter 2, Exercise 3
Remove and reorder excercises to match final version of the book.
Merge pull request #318 from Jazzatola/answerfix

Add answer/hint for Chapter 2, Exercise 3
Remove editorial comment
Update 03.answer.scala

Should be `&&` instead of `||`
08.answer.scala was the same as 07.answer.scala for chapter 9
Update and rename 19.answer.scala to 19.answer.markdown
Update 19.answer.markdown
Update 19.answer.markdown