- add dup2 functionality. This requires adding a ref cnt to the
  _WS_connections structure so that we only free the structure once
  all dup'd referenced are closed. Also, refactor malloc and free of
  connection structure into _WS_alloc and _WS_free.
- allow select to accept a NULL timeout value which means sleep
  forever instead of segfaulting.
- fix some compile warnings related to ppoll definition.
- move some WebSockets related html test pages into utils and symlink
  them from tests.