add test-doctests flag, as doctest-0.9.5 does not build with ghc 7.7 due to ghc api changes
add test-doctests flag, as doctest-0.9.5 does not build with ghc 7.7 due to ghc api changes

hvr/lens,danidiaz/lens,Gabriel439/lens,Icelandjack/lens,cdepillabout/lens,rpglover64/lens,timjb/lens,omefire/lens,hvr/lens,ddssff/lens,Fuuzetsu/lens,cchalmers/lens