Create a new handle to an Sdb account. All handles share the same per process or per thread HTTP connection to Amazon Sdb. Each handle is for a specific account. The params are passed through as-is to RightAws::SdbInterface.new Params:

   { :server       => 'sdb.amazonaws.com'  # Amazon service host: 'sdb.amazonaws.com'(default)
     :port         => 443                  # Amazon service port: 80 or 443(default)
     :protocol     => 'https'              # Amazon service protocol: 'http' or 'https'(default)
     :signature_version => '0'             # The signature version : '0' or '1'(default)
     :multi_thread => true|false           # Multi-threaded (connection per each thread): true or false(default)
     :logger       => Logger Object        # Logger instance: logs to STDOUT if omitted
     :nil_representation => 'mynil'}       # interpret Ruby nil as this string value; i.e. use this string in SDB to represent Ruby nils (default is the string 'nil')