Release note for version 1.37

Bug Fixes:
Version 1.37
1. Shorten DNS query session lifetime to 30 seconds. 
2. TCP connection states will be purged correctly after connection closed. (MAX session amount is 6000)
3. Update policy route code in order to avoid race condition which may cause system crash
4. Fixed UPNP service incompatible with Windows XP sp2 issue

Version 1.35
1. Web GUI allow user to input any valid IP address to DNS server and WINS server fields in DHCP server configuration.
2. Ftp data connection fails to bypass outbound ACL issue. This issue happen when user deny all traffic except FTP port 
   (TCP port 21) in outbound ACL. 
3. One connection should not have multiple log records.