Fix issue #788 - Only allow a single connect per endpoint for SUB, REQ, and DEALER sockets
Add Trevor Bernard to AUTHORS
Add tests/test_zap_ipc_creds to .gitignore
Merge pull request #789 from trevorbernard/single-connect

Single connect
Merge pull request #790 from trevorbernard/master

Add tests/test_zap_ipc_creds to .gitignore