ci: update to standard Makefile/travis config

.travis.yml

-# dist: trusty # KVM Setup
-
-notifications:
-  email: false
-
 os:
   - linux
   - osx
 
+sudo: false
+
 language: go
 
 go:
-    - 1.9
+  - 1.9.x
 
 install:
-  - go get github.com/whyrusleeping/gx
-  - go get github.com/whyrusleeping/gx-go
-  - gx install
-  - gx-go rw
+  - make deps
 
 script:
-  - go vet
-  - go test -v ./...
+  - bash <(curl -s https://raw.githubusercontent.com/ipfs/ci-helpers/master/travis-ci/run-standard-tests.sh)
+
+cache:
+    directories:
+        - $GOPATH/src/gx
 
 notifications:
   email: false
+
+env: GOTFLAGS="-race"

Makefile

+gx:
+	go get github.com/whyrusleeping/gx
+	go get github.com/whyrusleeping/gx-go
+
+deps: gx
+	gx --verbose install --global
+	gx-go rewrite
+
+publish:
+	gx-go rewrite --undo
+