* src/FeatureConfig.cc
(FEATURE_ASYNC_DNS): New definition.
(FeatureConfig): Added aysnc DNS entry.
To replace CommandUuid with Command* in SocketEntry and
NameResolverEntry:
* src/DownloadEngine.h
(CommandUuids): Removed.
(SocketEntry::commandUuid): Removed.
(SocketEntry::command): New variable.
(SocketEntry::SocketEntry): Updated.
(SocketEntry::operator==): Updated.
(NameResolverEntry::commandUuid): Removed.
(NameResolverEntry::command): New variable.
(NameResolverEntry::NameResolverEntry): Updated.
(NameResolverEntry::operator==): Updated.
(waitData): Changed the argument type.
(addSocketForReadCheck): Changed the argument type.
(deleteSocketForReadCheck): Changed the argument type.
(addSocketForWriteCheck): Changed the argument type.
(deleteSocketForWriteCheck): Changed the argument type.
(addNameResolverCheck): Changed the argument type.
(deleteNameResolverCheck): Changed the argument type.
* src/DownloadEngine.cc
(FindCommand): Removed.
(run): Removed activeUuid. Added activeCommands instead.
(AccumulateActiveUuid): Renamed as AccumulateActiveCommand.
(AccumulateActiveCommand): New function object.
(waitData): Use AccumulateActiveCommand.
(addSocketForReadCheck): Use Command instead of CommandUuid.
(deleteSocketForReadCheck): Use Command instead of CommandUuid.
(addSocketForWriteCheck): Use Command instead of CommandUuid.
(deleteSocketForWriteCheck): Use Command instead of CommandUuid.
(addNameResolverCheck): Use Command instead of CommandUuid.
(deleteNameResolverCheck): Use Command instead of CommandUuid.
* src/AbstractCommand.cc
(disableReadCheckSocket): Updated according to the changes in
DownloadEngine.
(setReadCheckSocket): Updated according to the changes in
DownloadEngine.
(disableWriteCheckSocket): Updated according to the changes in
DownloadEngine.
(setWriteCheckSocket): Updated according to the changes in
DownloadEngine.
(setNameResolverCheck): Updated according to the changes in
DownloadEngine.
(disableNameResolverCheck): Updated according to the changes in
DownloadEngine.
* src/AbstractCommand.cc
(disableReadCheckSocket): Updated according to the changes in
DownloadEngine.
(setReadCheckSocket): Updated according to the changes in
DownloadEngine.
(disableWriteCheckSocket): Updated according to the changes in
DownloadEngine.
(setWriteCheckSocket): Updated according to the changes in
DownloadEngine.
* release 0.7.1
