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Refs: #3732

Refs: #3732

Refs: #3756

- Add image.add_member missing content-length header
- Rename image-[add|del]member commands to members-[add|delete]
- Remove update option from image-register
- In image-compute split properties to properties-list and properties-get
- Add optional output to methods
 * image: unregister, members add/delete/set
 * image compute: delete, properties delete
- Transliterate methods to list-get-set-delete command groups:
 * image: members, member
 * image compute: properties

Refs :#3756 #3732

Apply the feature wherever is applicable
Generalize the feature by moving the corresponding code to _command_init

Refs: #3756 #3732

 - Add optional output for file methods: mkdir, touch, create, move, create,
    copy, move, append, delete, purge, info, meta, upload
 - Transliterate permissions and metadata methods to apear as get/set/delete
    command subgroups
    e.g. kamaki file metadata set ...
    instead of
    kamaki file setmeta
- Add method create_container to pithos client, add unit and functional tests

Also, kamaki.clients.pithos.copy/move_object returns response headers

Refs: #3756 #3732

Refs: #3756 #3732

In kamaki.clients
-------------------
- storage.create_directory returns response headers
- implement pithos.create_container

In kamaki.cli.pithos
-------------------
- add flag --with_output for optional output
- add (-j, --json) flag for optional json-formated output
- apply these changes to file_mkdir, file_touch, file_create

- Implement a print_json auxiliary method in kamaki.cli.utils
- Add a (-j, --json) flag to file list
- When -j or --json flag is on, only json is printed

Refs: #3732

Refs: #3608

Refs: #3608

Implemented with threads

Refs: #3608

Refs: #3608

The download_to_string method downloads a remote object from pithos into a
string, which is then returned.

Also, implemented unit and functional tests. Changelog is updated

Refs: #3608

 Also disallow moving deleted objects by version The later was implemented by
accident, due to the symetry between move and copy

Refs: #3737

Refs: 3737

Refs: #3739

Refs: #3736

Refs: #3735

Refs: #3735

Refs: #3707

Refs: #3707

Refs: 3707

Each upload involves a request that retrieves block size and hash information.
In higher level applications, this request is redudant after the first upload.
This feature allows higher level operations to cache retrieved container info
in a session.

Refs: #3707

Refs: #3730

If the upload is successfull, if the -l or --details argument is present,
kamaki lists all uploaded objects with all details returned by the server
(e.g. object version, date of creation, etc)

Refs: #3730

Refs: #3656

Refs: #3656

Methods affected:
    upload_object
    upload_object_unchunked
    upload_object_by_manifestation

unittests modified accordingly

Refs: #3656

kamaki file purge <container> -F

will automatically empty a container before purging it

Refs: #3662

Refs: #3728