Update TravisCI to use goclean script.

.travis.yml

@@ -1,3 +1,15 @@
 language: go
 go: release
-install: go get -d -t -v ./...
+before_install:
+  - gocleandeps=c16c849abae90c23419d
+  - git clone https://gist.github.com/$gocleandeps.git
+  - goclean=71d0380287747d956a26
+  - git clone https://gist.github.com/$goclean.git
+install:
+  - go get -d -t -v ./...
+  - bash $gocleandeps/gocleandeps.sh
+script:
+  - export PATH=$PATH:$HOME/gopath/bin
+  - bash $goclean/goclean.sh
+after_success:
+  - goveralls -coverprofile=repo.cov -service=travis-ci