Replace (un)lines' and (map,on)Lines with an iso
Define action* in Yi.Lexer.Alex using lambdas
Remove pureM from Yi.Core
Add docs to combinators in Yi.Keymap.Keys
Use Mode Binary instance
Use a <$> instead of pure a <*>
Use OverloadedStrings and IsString with Data.Rope
Use lenses a bit more in Yi.Buffer.Misc
Use a pipe instead of WriterT in Yi.Buffer.Misc
Use lens operators more in Yi.Buffer.Misc
Use convenience operators more and add docs in a few places