Fix travis coveralls integration

Author: mikkeloscar

.travis.yml

@@ -1,12 +1,8 @@
 language: go
 go:
-  - 1.5
-  - 1.6
+  - 1.7
   - tip
 before_install:
-  - go get github.com/axw/gocov/gocov
   - go get github.com/mattn/goveralls
-  - if ! go get code.google.com/p/go.tools/cmd/cover; then go get golang.org/x/tools/cmd/cover; fi
 script:
-    - $HOME/gopath/bin/goveralls -service=travis-ci
-
+  - $HOME/gopath/bin/goveralls -service=travis-ci