Update CLI to 2.6.3, and include the deployment tool

* Install includes AWS-ElasticBeanstalk-CLI-2.6.3/AWSDevTools/Linux/AWSDevTools-RepositorySetup.sh
* Install includes AWS-ElasticBeanstalk-CLI-2.6.3/AWSDevTools/Linux/scripts
Merge pull request #169 from nitrous-io/elasticbeanstalk-update

Update CLI to 2.6.3, and include the deployment tool