Merge pull request #5 from vincenthz/travis-update

Travis update to use container based infrastructure

.travis.yml

@@ -1,8 +1,10 @@
+sudo: false
+
 env:
  - CABALVER=1.16 GHCVER=7.0.4
  - CABALVER=1.16 GHCVER=7.4.2
  - CABALVER=1.18 GHCVER=7.6.3
- - CABALVER=1.18 GHCVER=7.8.3
+ - CABALVER=1.18 GHCVER=7.8.4
  - CABALVER=1.22 GHCVER=7.10.1
  - CABALVER=head GHCVER=head
 
@@ -10,32 +12,36 @@ matrix:
   allow_failures:
    - env: CABALVER=head GHCVER=head
 
+addons:
+    apt:
+        sources:
+         - hvr-ghc
+        packages:
+         - cabal-install-1.16
+         - cabal-install-1.18
+         - cabal-install-1.20
+         - cabal-install-1.22
+         - cabal-install-head
+         - ghc-7.0.4
+         - ghc-7.4.2
+         - ghc-7.6.3
+         - ghc-7.8.4
+         - ghc-7.10.1
+         - ghc-head
+
 before_install:
- - travis_retry sudo add-apt-repository -y ppa:hvr/ghc
- - travis_retry sudo apt-get update
- - 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:$PATH
 
 install:
  - cabal --version
  - echo "$(ghc --version) [$(ghc --print-project-git-commit-id 2> /dev/null || echo '?')]"
  - travis_retry cabal update
- - if [ "${GHCVER}" = "7.0.4" ]; then
-    cabal install --only-dependencies;
-   else
-    cabal install --only-dependencies --enable-tests;
-   fi
+ - if [ "${GHCVER}" = "7.0.4" ]; then cabal install --only-dependencies; else cabal install --only-dependencies --enable-tests; fi
 
 script:
- - if [ "${GHCVER}" != "7.0.4" ]; then
-      cabal configure --enable-tests -v2;
-   else
-      cabal configure -v2;
-   fi
+ - if [ "${GHCVER}" != "7.0.4" ]; then cabal configure --enable-tests -v2; else cabal configure -v2; fi
  - cabal build
- - if [ "${GHCVER}" != "7.0.4" ]; then
-       cabal test;
-   fi;
+ - if [ "${GHCVER}" != "7.0.4" ]; then cabal test; fi;
  - cabal check
  - cabal sdist
  - export SRC_TGZ=$(cabal info . | awk '{print $2 ".tar.gz";exit}') ;