build: add TravisCI configuration file

Change-Id: Id10840e6dd9de4e1dc164b2fdde199b5630287e2
Reviewed-on: https://upspin-review.googlesource.com/8961
Reviewed-by: Rob Pike <r@golang.org>
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..347baf2
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,5 @@
+language: go
+go:
+- 1.8.x
+go_import_path: aws.upspin.io
+script: go test -short -race ./...