Added high level API for send / receive with flag (SNDMORE).
Added get/set sockopt high level functions. Added high level poll functions.
Added high level functions for PSocket type.
Added more example.
Fixed TPollItem definition (see https://github.com/nim-lang/nim-zmq/issues/14)
Added high level API for send / receive with flag (SNDMORE). Added get/set sockopt high level functions. Added high level poll functions. Added high level functions for PSocket type. Added more example. Fixed TPollItem definition (see https://github.com/nim-lang/nim-zmq/issues/14)