29. Improving turn around time - WebKit porting to Mona OS

Hajime Morrita strongly recommend me to use more high-spec machine or EC2 for building WebKit.
I think he is right, but we should also improve whole turn around time. Almost time is spent on making an OS image and booting from it.
Fortunately we can send a new webkit browser binary from Host using socket. Mr.X wrote the system.

To make this work, we should fix one problem. After the WebKit browser exits, one of another process is killed.
Today I fixed the bug. In short, we forgot to delete timer on thread destruction.