TheVoid: Fixed several issues connected with signals

Added stop handlers for SIGALRM.
Added reload handler for SIGHUP (do nothing right now).
Added ignoring of SIGUSR1, SIGUSR2.
TheVoid: Add message to logger on signal
Swarm: Added ability to reopen log file

TheVoid: Added support for SIGHUP
TheVoid: Don't reopen log on SIGUSR*
v0.6.1.0
RHEL: RHEL doesn't know that std::signal == ::signal
TheVoid: Fixed behaviour on 400 and 404

If http request is invalid we should send 400 error code and
close TCP connection.
If handler is not found we should read all the data and wait for
next http request.
Merge branch 'master' of github.com:reverbrain/swarm

Conflicts:
	thevoid/connection.cpp
	thevoid/server_p.hpp
Reuse keep alive socket if noreply was sent