Remove select - connection level command.
Completely remove select.

This is a connection level command and is now handled by the server.
Remove multi and command.

The multi chain functionality has been moved to the client module. Also
do not emit req events the monitor functionality is provided by the
server module.
0.1.11
Do not emit res event.
Remove Request object.
Remove request and response.
Database methods are sync.

Update test specs.
Remove async dependency.
Tidy key store class.
Update readme.
0.1.12
Add private write() method.
Emit key with value.
Pass key and value to event.
Allow passing request as last arg.
0.1.13
Coerce integers to strings for storage.
Tidy store class.
Restore mget and mset tests.