add cross compilation and deploy to github release

.travis.yml

@@ -3,12 +3,23 @@ go:
  - 1.7
 
 install:
+  - go get github.com/mitchellh/gox
+  - go get github.com/tcnksm/ghr
   - go get github.com/mattn/goveralls
 
 script:
  - go test -v -covermode=count -coverprofile=coverage.out
  - goveralls -coverprofile=coverage.out -service=travis-ci -repotoken $COVERALLS_TOKEN
 
+after_success:
+  - gox -os "linux darwin" -arch "386 amd64" -output "dist/{{.Dir}}_{{.OS}}_{{.Arch}}"
+
+deploy:
+  provider: script
+  script: ghr --username alastairruhm --token $GITHUB_TOKEN --replace --debug $(git tag -l --contains HEAD) dist/
+  on:
+    tags: true
+
 notifications:
   slack: ruhm-pacino:vcSqblVd1vSDgaOzWLNbThfS