Remove travis support

.travis.yml

@@ -1,15 +0,0 @@
-sudo: false
-
-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:
-  - go test -v ./xmpp -covermode=count -coverprofile=coverage.out
-  - $HOME/gopath/bin/goveralls -coverprofile=coverage.out -service=travis-ci