Use gotest for Travis CI builds

Author: ChimeraCoder

.travis.yml

@@ -20,6 +20,7 @@ install:
 before_script:
   - go get -u github.com/ChimeraCoder/gojson/gojson
   - go get -d -v github.com/gogo/protobuf/protoc-gen-gogofaster
+  - go get github.com/rakyll/gotest
   - pushd $GOPATH/src/github.com/gogo/protobuf
   - git fetch
   - git checkout v0.5