travis integration

- go build instead of go install to support cross-compile to bin dir
- shellcheck fixes for build script

.travis.yml

@@ -0,0 +1,41 @@
+language: go
+sudo: required
+dist: trusty
+
+go:
+  - 1.7.x
+  - 1.8.x
+
+env:
+  global:
+  - PATH=$GOROOT/bin:$PATH
+  matrix:
+  - TARGET=amd64
+  - TARGET=arm
+  - TARGET=arm64
+  - TARGET=ppc64le
+  - TARGET=s390x
+
+matrix:
+  fast_finish: true
+
+install:
+ - |
+   go get github.com/containernetworking/cni || true
+   pushd ../cni
+     GOARCH="${TARGET}" ./build.sh
+   popd
+
+script:
+ - |
+   if [ "${TARGET}" == "amd64" ]; then
+     CNI_PATH="$(cd ../cni/bin && pwd)" GOARCH="${TARGET}" ./test
+   else
+     GOARCH="${TARGET}" ./build
+   fi
+
+notifications:
+  email: false
+
+git:
+  depth: 9999999