Use a common sandbox for building Cabal and cabal-install on Travis.
Use a common sandbox for building Cabal and cabal-install on Travis.

Peaker/cabal,garetxe/cabal,thoughtpolice/cabal,gbaz/cabal,enolan/cabal,randen/cabal,lukexi/cabal,bennofs/cabal,martinvlk/cabal,mmakowski/cabal,sopvop/cabal,mmakowski/cabal,garetxe/cabal,Heather/cabal,Peaker/cabal,bennofs/cabal,edsko/cabal,enolan/cabal,Heather/cabal,themoritz/cabal,thoughtpolice/cabal,thomie/cabal,mydaum/cabal,sopvop/cabal,lukexi/cabal,randen/cabal,themoritz/cabal,mydaum/cabal,martinvlk/cabal,headprogrammingczar/cabal,gbaz/cabal,edsko/cabal,trskop/cabal,kolmodin/cabal,themoritz/cabal,thomie/cabal,sopvop/cabal,trskop/cabal,headprogrammingczar/cabal,kolmodin/cabal