Migrate to charm-helpers, tidy up flake8
Merge 0.48.3 XFS and osd-format support.
Fixup parameter name in apt_install calls
Use refactored charmhelpers add_source
Add missing fetch helper
Ensure ceph-disk calls fail on error and zap disks if requested
Use new storage charmhelpers, configure_source redux
Add missing storage helper
Use device_mounted from ceph
Add ceph icon
Resync charm helpers from trunk
Resync with configure_source supporting proposed
resync with trunk of charm-helpers
Fixup dodgy disk detection
merging lp:~james-page/charms/precise/ceph-osd/charm-helpers as per https://code.launchpad.net/~james-page/charms/precise/ceph-osd/charm-helpers/+merge/173246