transmit signal only windows (#341)

* discard signal on non windows OS
* update README (no more detached behavior since discarding signal on non windows OS)

Signed-off-by: Denis Vaumoron <dvaumoron@gmail.com>

detect TTY mode on non windows OS to change TENV_DETACHED_PROXY defau…

…lt (#323)

* detect TTY mode on non windows OS to change TENV_DETACHED_PROXY default
* extract envname package from config
* specific method to check env var presence

Signed-off-by: Denis Vaumoron <dvaumoron@gmail.com>