use standard travis-ci scripts and enable sudo

This should fix CI.

Supersedes #34.

.travis.yml

 os:
   - linux
 
-language: go
+sudo: true
 
-sudo: false
+language: go
 
 go:
-  - 1.7
+    - 1.9.x
 
 install:
   - make deps
 
 script:
-  - make test
+  - 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

-export PATH := bin:$(PATH)
+export IPFS_API ?= v04x.ipfs.io
 
-deps: gxbins
-	bin/gx install --global
-	bin/gx-go rewrite
+gx:
+	go get -u github.com/whyrusleeping/gx
+	go get -u github.com/whyrusleeping/gx-go
 
-publish:
-	bin/gx-go rewrite --undo
-	bin/gx publish
-
-test: deps
-	go test -race -cpu=5 -v ./...
-
-gxbins: bin/gx-v0.6.0 bin/gx-go-v1.2.0
-
-bin/gx-v0.6.0:
-	mkdir -p bin
-	./bin/dist_get gx bin/gx-v0.6.0 v0.6.0
-	ln -s gx-v0.6.0 bin/gx
-
-bin/gx-go-v1.2.0:
-	mkdir -p bin
-	./bin/dist_get gx-go bin/gx-go-v1.2.0 v1.2.0
-	ln -s gx-go-v1.2.0 bin/gx-go
-
-clean:
-	rm -f bin/gx*
-	rm -rf bin/tmp
+deps: gx
+	gx --verbose install --global
+	gx-go rewrite