Remove textual read/write file functions (#9)
MVar and IORef (fixes #11)
pritn lives in MonadIO (fixes #13)
intersperse
intercalate
nub
subsequences and permutations
find
Merge branch 'intersperse'
Merge branch 'find'
Merge branch 'subsequences'

Conflicts:
	classy-prelude/ClassyPrelude/List.hs
Merge branch 'nub'

Conflicts:
	classy-prelude/ClassyPrelude/Classes.hs
	classy-prelude/ClassyPrelude/List.hs
	classy-prelude/ClassyPrelude/Vector.hs