Remove domain.zone.version.new_version

'new' is a class method so the 'domain.zone.version.new' Gandi method
does not conflict with Ruby 'new' method and the 'new_version' alias is
not needed.
Undefine 'clone' method on ProxyCall class

Undefine 'clone' method so that the gandi method
'domain.zone.clone' can be used without its alias
'clone_zone'.
Merge pull request #10 from gdott9/clone_and_new

Remove aliases for clone and new methods