Announcing the Beta version of iBLab, a C++ library for talking to
iButtons.

At this stage, all we're looking for are beta testers who can code C++ - to take
a look, try it on a few platforms, comment on the approach, and all that stuff
- and maybe even add some new bits.

What it does, so far:

  * Scan the 1-wire bus for devices (yes, it can handle multiple devices).
  * Identify them (currently only DS1920 and DS1994 but they are easy to add
    [admittedly using some of the nastiest macros ever witnessed]).
  * Read and write scratchpad and NVRAM (not using recommended TMEX checksums,
    layout, etc. Yet).
  * That's all folks.
