add coveralls trigger

.travis.yml

@@ -6,5 +6,14 @@ addons:
     - libxml2-dev
     - libxmlsec1-dev
 
+before_install:
+  - go get github.com/axw/gocov/gocov
+  - go get github.com/mattn/goveralls
+  - go get code.google.com/p/go.tools/cmd/cover
+
+script:
+  - go test -v -covermode=count -coverprofile=coverage.out ./...
+  - goveralls -coverprofile=coverage.out -service travis-ci -repotoken $COVERALLS_TOKEN
+
 go:
   - 1.5