run apt-get update before installing, and clean after installing

Signed-off-by: Martin Jensen <maage@dotmaage.dk>
use --no-install-recommends when installing dependencies

Signed-off-by: Martin Jensen <maage@dotmaage.dk>
Updated to use long parameters

Signed-off-by: Martin Jensen <maage@dotmaage.dk>
Updated docker-api gem version

Signed-off-by: Martin Jensen <maage@dotmaage.dk>
Updated acceptance test to expect a clean exit

Signed-off-by: Martin Jensen <maage@dotmaage.dk>
Updated Travis-CI file with specific compatible version

Signed-off-by: Martin Jensen <maage@dotmaage.dk>
Updated to Atlassian Confluence 5.6.5
Merge branch '5.6.5'