Improvements
state-t, seq as fn and part of maybe
Made seq take an optional argument
Maybe monad
added lift
Added chain
fixed typo
Merge pull request #2 from mkaltenbach/patch-1

fixed typo
Maybe monad transformer
Merge remote-tracking branch 'origin/master'
Fixed maybe transformer
vector, list and set monad transformers
Added writer monad transformer
Fixed do.
Fixed zero for state-t
Fixed bug in state transformer
Added deref to state-transformer
Fixed typo
Added update-in-val, get-in-val and assoc-in-val
Added doc strings