add documentation.
update README.md
Merge branch 'develop'

simplify apiary-cookie.
new package: apiary-clientsession, apiary-authenticate.
changes:
  redirect functions not stop now.
  delete Monad transformer from Apiary, Action(it isn't usseful form and
      ApiaryT Monad transformer cannot be MonadBaseControl. so I
      chooosed MonadBaseControl.)
update example.