Gandi-cli

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* Add and update License information to use GPL-3
* Uniformize help strings during creation/deletion commands

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* New mail namespace for managing mailboxes and aliases
* New command 'disk create' to create a virtual disk
* New command 'vm ssh' to open a ssh connection to an existing
virtual machine
* New command 'help' which behave like --help option.
* Using 'gandi namespace' without full command will display list
of available commands for this namespace and associated short help.
* 'gandi paas create' and 'gandi vm create' commands now use sshkeys,
and default to LU as default datacenter.

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* Fixes Debian packaging

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* Fixes bug with snapshotprofile list command preventing
'gandi setup' to work after clean installation
* Allow Gandi CLI to load custom modules/commands using
'GANDICLI_PATH' environment variable

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* New certificate namespace for managing certificates
* New disk namespace for managing iaas disks
* New snapshotprofile namespace to know which profiles exists
* Allow override of configuration values for apikey, apienv and apihost
using shell environment variables API_KEY, API_ENV, API_HOST.
* Bugfixes on various vm and paas commands
* Fixes typos in docstrings
* Update man page

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* New vhost namespace for managing virtual host for PaaS instances
* New sshkey namespace for managing a sshkey keyring
* Bugfixes on various vm and paas commands
* Bugfixes when using a hostname using only numbers
* Added a random unique name generated for temporary VM and PaaS