Added error assertion helper
Modified tests/runner to include herlpers
Modified conversions to include '*_from_m'

'from_m' is the mnemonic adopted for 'from MATLAB'
Modified util/socket to include custom conversion

- socket type from MATLAB
Modified util/sockopt to improve option lookup

- augmented with 'from_m' field ('from MATLAB' conversion function)
- custom conversions for mechanism also included
Added zmq_setsockopt
Included zmq_setsockopt in compile_list
Included test_zmq_setsockopt
Added zmq_close
Included zmq_close in compile_list
Modified test_zmq_socket to test zmq_close
Improved test_get/setsockopt

- zmq_close and zmq_ctx_term included
- assert_does_not_throw also included, avoiding wordier messy code
Included return status test in test_zmq_socket
Added zmq_bind
Included zmq_bind in compile_list
Included test_zmq_bind
Generalized assertions in test_zmq_bind
Added zmq_unbind
Included zmq_unbind in compile_list
Modified test_zmq_bind to test zmq_unbind