Travis ci (#15)

* Adding travis-ci for go package and docker build

.goreleaser.yml

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+# This is an example goreleaser.yaml file with some sane defaults.
+# Make sure to check the documentation at http://goreleaser.com
+builds:
+- env:
+  - CGO_ENABLED=0
+archive:
+  replacements:
+    darwin: Darwin
+    linux: Linux
+    windows: Windows
+    386: i386
+    amd64: x86_64
+checksum:
+  name_template: 'checksums.txt'
+snapshot:
+  name_template: "{{ .Tag }}-next"
+changelog:
+  sort: asc
+  filters:
+    exclude:
+    - '^docs:'
+    - '^test:'

.travis.yml

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+language: go
+
+go:
+  - 1.8.3
+
+services:
+  - docker
+
+script:
+  - true
+
+after_success:
+  - test -n "$TRAVIS_TAG" && curl -s https://raw.githubusercontent.com/goreleaser/get/master/latest | bash
+  - CGO_ENABLED="0" GOARCH="amd64" GOOS="linux" go build -a -installsuffix cgo -o ./app
+  - docker login -u $DOCKER_USER -p $DOCKER_PASSWORD
+  - export REPO=peakcom/s5cmd
+  - echo $REPO:$TRAVIS_BRANCH
+  - docker build -f Dockerfile -t $REPO:$TRAVIS_BRANCH .
+  - docker push $REPO:$TRAVIS_BRANCH
+  - export TAG=`if [ "$TRAVIS_BRANCH" == "master" ]; then echo "latest"; else echo $TRAVIS_TAG ; fi`
+  - if [[ ! -z "${TAG}" ]]; then docker tag $REPO:$TRAVIS_BRANCH $REPO:$TAG; fi
+  - if [[ ! -z "${TAG}" ]]; then docker push $REPO:$TAG; fi

Dockerfile

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+FROM alpine
+ADD app /app
+CMD ["./app"]