Use cat' sep lens instead of removed field accessor
No need to hide 'over', which is no longer re-exported
Do not generate lenses for Image, PolygonOpts; these are in -lib now
Use lenses or _field accessors
Merge branch 'master' into lens
travis: check out same-named branches of -core, -lib if they exist
More lens stuff
Merge branch 'lens' of https://github.com/diagrams/diagrams-contrib into lens

Out of seek with head
& to ^&
hide over form prelude
updated Lens.hs
Remove lenses provided in diagrams-lib
Add type constraints required by lensification of envelope
newtype to Wrapped
D.Example.Logo: minor code cleanup
D.Lens: delete commented-out code
Merge pull request #21 from diagrams/lens

Lens