Cisco ASA updates

Changes:

Cisco ASA Syntax:

    ASA 8.3 object nat:

        object network obj-1.2.3.1-255
         nat (inside,outside) static 1.2.3.4

    ICMP under object-group service:
    
        object-group service whatever
            service-object icmp

    More tollerance for missing "exit"s under config t mode:

        Before:

            configure terminal
              vlan 1
                name asdf
              exit

              object-group network WHATEVER
               network-object host 1.2.3.4
              exit
            exit


        Now:

            configure terminal
              vlan 1
                name asdf

              object-group network WHATEVER
               network-object host 1.2.3.4
            exit
    
    Other minor bugfixes