ChangeLog: updated for version v0.5.0
started work on v0.5.1
lib,test: fixed lint issues

Added missing semicolons.
README: howto signal SIGUSR1 on windows

Added a short description how to enable debugger in a running process
on Windows.
README: added WTF entry about adblock
Updated AUTHORS.
Remove dependence on HTTP for socket io connection to server
Updated AUTHORS.
test: fixed launcher errors on windows

Fixed debugger launcher to ignore ECONNRESET error when shutting down the
session.