Travis integration (#183)

.travis.yml

+sudo: required
+
+language: generic
+
+env:
+  - DOCKER_COMPOSE_VERSION=1.14.0
+
+install:
+  # Installing docker
+  - curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
+  - sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
+  - sudo apt-get update
+  - sudo apt-get -y install docker-ce
+
+  # Installing docker-compose
+  - sudo rm /usr/local/bin/docker-compose
+  - curl -L "https://github.com/docker/compose/releases/download/${DOCKER_COMPOSE_VERSION}/docker-compose-$(uname -s)-$(uname -m)" > docker-compose
+  - chmod +x docker-compose
+  - sudo mv docker-compose /usr/local/bin
+
+before_script:
+  # Check docker & docker-compose versions
+  - docker --version
+  - docker-compose --version
+
+script:
+  - docker-compose build
+  - docker-compose up -d
+
+  # Verifications
+  - sleep 4m
+  - docker-compose logs
+  - curl --retry 10 --retry-delay 5 -v http://localhost:9200/ -u elastic:changeme
+  - curl --retry 10 --retry-delay 5 -v http://localhost:5601/

README.md

 # Docker ELK stack
 
-[![Join the chat at https://gitter.im/deviantony/docker-elk](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/deviantony/docker-elk?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![Elastic Stack version](https://img.shields.io/badge/ELK-5.6.3-blue.svg?style=flat)](https://github.com/deviantony/docker-elk/issues/182)
+[![Join the chat at https://gitter.im/deviantony/docker-elk](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/deviantony/docker-elk?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![Elastic Stack version](https://img.shields.io/badge/ELK-5.6.3-blue.svg?style=flat)](https://github.com/deviantony/docker-elk/issues/182)
+[![Build Status](https://api.travis-ci.org/deviantony/docker-elk.svg?branch=x-pack)](https://travis-ci.org/deviantony/docker-elk)
 
 Run the latest version of the ELK (Elasticsearch, Logstash, Kibana) stack with Docker and Docker Compose.