Merge branch 'bufferevent5'

changes/bufferevent-support

configure.in

src/common/compat_libevent.c

src/common/compat_libevent.h

src/common/crypto.h

src/common/tortls.c

src/common/tortls.h

src/or/Makefile.am

src/or/buffers.c

src/or/buffers.h

src/or/config.c

src/or/connection.c

src/or/connection.h

src/or/connection_edge.c

src/or/connection_edge.h

src/or/connection_or.c

src/or/control.c

src/or/cpuworker.c

src/or/directory.c

src/or/dirserv.c