Add testCanInstallMultipleVersionsOnSameMachine
initial support for the docker entity

bumped the jclouds.version to 1.7.2-ea-brooklyn.2
support for docker in jcloudsLocation
Added AbstractApplication.doStart method to override of core start logic whilst keeping Lifecycle maintenance
Merge pull request #1257 from andreaturli/docker

initial support for the docker entity (DO NOT MERGE)
Merge pull request #1269 from Nakomis/fix/abstract-application-dostart

Added AbstractApplication.doStart method to override of core start logic...
Merge pull request #1220 from aledsage/test/multipleVersionsOnSameMachine

Add testCanInstallMultipleVersionsOnSameMachine