[*] library update: fixed null pointer exception while performing action over a null cursor
[+] added check icon
[~] updated license for check icon
[+] added exit menu item (without support from activity side)
[+] added method for stopping vpn service
[+] added methods for stopping vpn service and deactivating vpn tunnel
[*] fix for notifications: notifications depend on service/tunnel state for now
[~] Models support visibility for now
[*] fixed default value for "on demand enabled by user" option
[*] process item clicks on enabled models only
[+] IpSecTunnel sets local address for now
[+] adding a model for the icon at left
[+] support for exit menu item
[+] showing checks on the active tunnel
[+] showing/hiding switch when VPN service is up/down
[+] version increased