Install gometalinter in travis instead

.travis.yml

@@ -7,6 +7,8 @@ install:
   - wget -O dep https://github.com/golang/dep/releases/download/v0.5.0/dep-linux-amd64
   - chmod +x dep
   - mv dep $GOPATH/bin/dep
+  - go get github.com/alecthomas/gometalinter
+  - gometalinter --install
 script:
   - ./configure && make test
 sudo: false