Adds support for a new logs option

[leops]

This new option allows you to use files instead of stdout and stderr.
It is defined as follow :

logs: {
out: 'your stdout file',
err: 'your stderr file'
}

If you define one of this options, the server's stdout/stderr will be piped to the file with path.resolve and fs.createWriteStream with the flag 'a'.
If you don't define and option, the output will be redirected to process.stdout like it used to behave.

[paulpflug]

hi
I just rewrote the io handling (dev branch). There is no problem with piping stdout, but if I pipe stderr, syntax errors will not be catched.
I have to use inherit stderr in Node spawn args to get these errors to the console.
So you mind if only stdout is pipeable to file?

[leops]

I think waiting for the open event of the err writeStream, and then think specifying the file's id instead of process.stderr in stdio should work.

[paulpflug]

could you have a look at 9a8882b ?

[leops]

That should do it. However it still has the same problem as my PR : createWriteStream throws an error if the folder containing the log files doesn't exist. But a simple call to mkdirp should fix that.

[drawveloper]

Merged into branch 0.5 along with dev branch.