add augeas ppa to travis
add augeas ppa to travis

in #27, we were still missing the adon of the actual ppa:
see: http://docs.travis-ci.com/user/migrating-from-legacy/#Adding-APT-Sources

dhoppe/modulesync_config,voxpupuli/modulesync_config,voxpupuli/modulesync_config,voxpupuli/modulesync_config,dhoppe/modulesync_config,puppet-community/modulesync_config,voxpupuli/modulesync_config,dhoppe/modulesync_config,dhoppe/modulesync_config