Add TravisCI config.

.gitignore

@@ -1,5 +1,6 @@
 dist/
 .*
+!.travis.yml
 cabal.config 
 cabal.sandbox.config
 examples/*

.travis.yml

@@ -0,0 +1,28 @@
+language: haskell
+
+ghc:
+  - 7.6
+  - 7.8
+
+install:
+  - cabal install --only-dependencies --enable-tests --enable-benchmarks --force-reinstalls
+
+notifications:
+  email: true
+
+script:
+  - cabal configure --enable-tests --enable-benchmarks
+  - cabal build
+  - cabal test
+  - cabal check
+  - cabal sdist
+
+  # check that the generated source-distribution can be built & installed
+  - export SRC_TGZ=$(cabal info . | awk '{print $2 ".tar.gz";exit}') ;
+    cd dist/;
+    if [ -f "$SRC_TGZ" ]; then
+      cabal install "$SRC_TGZ";
+    else
+       echo "expected '$SRC_TGZ' not found";
+       exit 1;
+    fi