update RPC interface
add implementation for Min in paxos_impl
add recover/consul.go as recover manager
add appserver rpc addr and handler
Add recover mechnism [untested!]
add appserver rpc addr
implemented appserver rpc interface
updated paxos interface for copying data
update appserver to handle requests while paused
correct recovery under perfect network environment
fix: update config file
fix: stringify json object returned by getdoc