Revert "testing stackage-1.9 lts debian package"

This reverts commit 6e39fe91ba.

.travis.yml

@@ -9,13 +9,15 @@ deploy:
   local_dir: to-travis
   upload-dir: stackage-server
 
+env:
+ - CABALVER=1.20 GHCVER=7.8.4
+
 # Note: the distinction between `before_install` and `install` is not important.
 before_install:
- - travis_retry gpg --keyserver pgp.mit.edu. --recv-keys 44A52A60
- - gpg --export --armor 44A52A60 | sudo apt-key add -
+ - travis_retry sudo add-apt-repository -y ppa:hvr/ghc
  - travis_retry sudo apt-get update
- - travis_retry sudo apt-get install stackage
- - export PATH=/opt/ghc/ghc*/lts*/bin:/opt/ghc/ghc*/lts*/stackage/bin:$PATH
+ - travis_retry sudo apt-get install cabal-install-$CABALVER ghc-$GHCVER # see note about happy/alex
+ - export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$HOME/.cabal/bin:$PATH
 
 install:
  - cabal --version