Start a new debugger thread to listen for commands.
Start a TCP server in the debugger thread.
Pass header sent from client.
Pass debugger messages between V8 debugger.
Send connect message if client is connected.
Make --debug-brk work.
win: Fix compilation error.
Send message to client in debugger thread.
Merge pull request #626 from atom/v8-debugger

Implement V8 debugger agent