Add travis tests.

.travis.yml

@@ -0,0 +1,20 @@
+language: c
+
+env:
+- PATH=~/racket/bin:$PATH
+
+before_install:
+- curl -L -o installer.sh http://www.cs.utah.edu/plt/snapshots/current/installers/min-racket-current-x86_64-linux-precise.sh
+- sh installer.sh --in-place --dest ~/racket/
+
+install:
+- racket -l- pkg/dirs-catalog --link --check-metadata pkgs-catalog .
+- echo `pwd`/pkgs-catalog/ > catalog-config.txt
+- raco pkg config catalogs >> catalog-config.txt
+- raco pkg config --set catalogs `cat catalog-config.txt`
+- raco pkg install typed-racket typed-racket-test
+
+script:
+- racket -l tests/typed-racket/run --all
+
+after_script: