* Allow an env prop to configure whether we want to use the backwards
      compatible (but not standards compliant) HMAC-MD5, or whether we want
      to use the not-backwards compatible (but standards compliant) one.  No
      one should touch this setting, unless your name is toad or jrandom ;)
    * Added some new dummy facades
    * Be more aggressive on loading up the router.config before building the
      router context
    * Added new hooks for apps to deal with previously undefined I2NP message
      types without having to modify any code.
    * Demo code for using a castrated router for SSU comm (SSUDemo.java)