vpnc-script for osx

[Justin]

Hello guys

I installed openconnect from homebrew on OS X 10.10.5, the vpnc-script
has some issue, such as: it does not delete $VPNGATEWAY after being
killed, then if my network changes, the default gw changes, it will
not be able to connect to the   $VPNGATEWAY, so I did a heavy
modification on the vpnc-script, it works perfect now, I'm not expert,
your suggestions on my script will be very welcome.

 https://gist.github.com/cattyhouse/f3e2d1621e731ea7e26f