drop travis

.travis.yml

@@ -1,9 +0,0 @@
-language: go
-go:
-  - tip
-before_install:
-  - go get github.com/axw/gocov/gocov
-  - go get github.com/mattn/goveralls
-  - if ! go get github.com/golang/tools/cmd/cover; then go get golang.org/x/tools/cmd/cover; fi
-script:
-  - $HOME/gopath/bin/goveralls -service=travis-ci