CHANGELOG for version 0.9

Bug Fixes:

- Stop shell from destroying the config instance
- Shell can manage all valid command line arguments [#3716]
- Restore 2nd level command syntax in shell [#3736]
- Allow copy of deleted objects by refering to older version [#3737]

Changes:

- Change context: kamaki-image-addproperty --> kamaki-image-compute-property
- http logger names: clients.recv/send --> kamaki.clients.recv/send
- Move logger creation and control (except of the actuall logging) to cli
- These PithosClient methods return the metadata of created object [#3656]:
    upload_object, upload_object_unchunked, create_object_by_manifestation
- Cache container info per upload session [#3735]
- Disallow moving deleted objects by version [#3737]
    This operation was implemented by accident, due to the symetry between
    move and copy
- Rename file-meta commands to file-metadata
- Add optional output for file methods [#3756, #3732]:
    mkdir, touch, create, move, copy, move, append, truncate, overwrite,
    manifest, upload, delete, purge, unpublish, permissions set/delete, info,
    metadata set/delete, containerlimit set, versioning set, group set/delete,
    upload, overwrite
- Transliterate permissions, versioning, group and metadata methods to
    get-set-delete command groups

Features:

- A logger module container a set of basic loging method for kamaki [#3668]
   set/get_log_filename, add_file/strean_logger, get_logger
- Implement logger.activate/deactivate for loggers [#3715]
- Allow global args (e.g. -d for debug, -v for verbosity) to shell. They
    should be used when invoking the shell. After that they are automatically
    applied to all commands running in that kamaki shell. [#3716]
- Implement a plankton-side image unregister [#3728]
- Implement purging a non-empty container [#3662]
- Add a -l option to upload, for listing uploaded objects details [#3730]
- Add option to cache container info for upload_object [#3707]
- Add enumeration to all listing commands, make it optional [#3739]
- Add a download_to_string method in pithos client [#3608]
- Add an upload_from_string method in pithos client [#3608]
- Add pithos client method create_container [#3756]