add TcpConnection::forceCloseWithDelay(seconds)
fix race condition of 'both timer and connection in one active channel list'
add WeakCallback.h
line 130,131: use Timestamp::kMicroSecondsPerSecond instead of 1000000
Fix race condition in RpcChannel::CallMethod()

This has been fixed in muduo-protorpc long time ago.
add examples/ace/ttcp
minor fixes
add simple Protobuf codec for single message type.
add RpcCodec format test.
re-implement RpcCodec with ProtobufCodec
move LogFile::File to FileUtil::AppendFile
replace string with StringPiece in parameter
add examples/ace/logging
add examples/ace/logging/client.cc
add header for release build
add InetAddress::resolve for sync DNS resolving with gethostbyname_r
ttcp
std::string to muduo::string in base/tests
update MacOSX.diff
comment on dangling else in LOG_*