Merge pull request #6 from crowbar/release/pebbles/master

Release/pebbles/master
Merge pull request #7 from crowbar/release/pebbles/master

Release/pebbles/master
change url to updated image
typo
Merge pull request #96 from MirantisDellCrowbar/bug/DCB-127/pebbles/master

change url to updated ubuntu image