Code for simple NSIS installer added

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
Merge branch 'master' of github.com:250bpm/nanomsg
usock_posix.inc beautified a bit

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
Few diagram beautifications

* Changed delimiter from "," to ":" on edge labels
* Add warnings for non-matched sources or actions in FSM

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>