[bind10-dev] each status

[Evan Hunt]

Done:
- Removed boost::asio and custom code in favor of plain ASIO;
  ready for review in trac #168
- Added a command line option to listen on a specific address.
  I did not add tests for this feature as I couldn't think of a way
  to do it with the unit test framework.  Jinmei's made a suggestion
  for a way to test part of it, which I can look into.  This is
  trac #167.
- Implemented a basic LRU cache data structure (just a linked list
  for now). 

Coming up:
- Hook the cache into doQuery()
- Speed up cache access by adding a hash table or std::map or something.

-- 
Evan Hunt -- each at isc.org
Internet Systems Consortium, Inc.