make PatternLayout configuration work

[takumakanari]

First off, thanks for your great product, to use Fluency with log4j.

I made this patch to use PatternLayout in log4j configuration.

Could you check this?

Thanks.

[lobeck]

Thanks for your contribution and your warm words!

It's a nice patch, just gave it a quick test and it worked without breaking backwards compatibility. Will prepare a release for this.

[takumakanari]

@lobeck Thank you!

[lobeck]

You're welcome! Release is done and should be visible on maven central shortly.