* moving to java 1.6
 * slightly modify demo page
 * wrap methods with AccessController.doPrivileged

   from the fine manual:
   (http://docs.oracle.com/javase/6/docs/api/java/security/AccessController.html)

       The AccessController class is used for access control operations and
       decisions.

       More specifically, the AccessController class is used for three
       purposes:

           to decide whether an access to a critical system resource is to be
       allowed or denied, based on the security policy currently in effect,

           to mark code as being "privileged", thus affecting subsequent access
       determinations, and

           to obtain a "snapshot" of the current calling context so
       access-control decisions from a different context can be made with
       respect to the saved context.
 * add some doc
 * remove target/* from versioning control
 * add instruction to compile the applet
 fix presence/qualify and incoming call handling

 without those changes applet does not respond properly
 to server poke hence asterisk is not able to qualify our
 "presence". that means no incoming calls.
 then we fix handshaking logic in BinderSE to dela properly
 with incoming calls.