fix addr info in async_on_accept

Use getpeername() instead of getsockname(). peername pulls the sockaddr info of the remote connection. sockname pulls the info of the local connection.
Merge pull request #183 from thanos-k/next-3.0

Small fix in regexp.cc
Merge pull request #184 from stavros-swmud/next-3.0

fix addr info in async_on_accept
Restore TELNET_GA after prompt. By Stavros.
Merge pull request #186 from sunyc/master

Patches from stavros
Remove all register modifier (depercated).
clang-format
Move libtelnet to thirdparty/libtelnet.
Move ThreadPool to thirdparty/ , Update libtelnet.
Fix travis build
remove network multithreading as a failed experiment
clang 3.5 format source
Remove libevent-pthreads requirements
remove TODO section from ChangeLog
Rename ChangeLog to ChangeLog.mudos
making zlib detection work for libtelnet
fix travis build
Remove all malloc wrappers except debugmalloc.
Move interactive_t to dedicated header, move global user management function to user.cc
adding --enable-gcov and update result to coveralls