Deprecated unsupported key types

[jhecking]

Aerospike officially supports only integers, strings and bytes as record keys [1]. However the Ruby client currently accepts any data type as record key that is supported as a bin value, i.e. floats and even complex data types such as lists and maps are accepted as record keys.

Support for record keys other than integer, string and bytes should be deprecated in v2.x and removed in v3.0.

[1] http://www.aerospike.com/docs/architecture/data-model.html

[jhecking]

The client will warn whenever a key of unsupported type is created. Call Aerospike::Key.disable_unsupported_key_warning! to suppress the warning.