Small typo in restart message
This replaces the addon with the new child process API in node core. This branch is for node 0.8.x only - 0.6.x support will be continued as a separate release series.
Get rid of `node-fork`. So far this only works on `node v0.7.x` due to usage of `silent` option in `child_process.fork` options. This also adds a `fork-shim`, which allows us to spawn arbitrary commands using `child_process.fork`.