Add AlongsideLeft and AlongsideRight
Merge branch 'master' of github.com:ekmett/lens
Generalized `alongside` using Ryan Ingram's trick as in `lens-family` 1.0

* http://twanvl.nl/blog/haskell/cps-functional-references#comment-comment0)
Merge branch 'master' of https://github.com/ekmett/lens
hlint fixes