Merge pull request #17 from bzeller/master

AbstractHttpServerRequestHandler should have a virtual destructor
Update HACKING.md
Documenting WebSocket's unsafe signals
HACKING.md: Preparing a release
Merge branch 'master' into threads
Changing style to be consistent with the rest of Tufão
Merge remote-tracking branch 'upstream/threads' into fd-based

Conflicts:
	src/abstractconnectionhandler.h