CocoaLumberjack Subproject

I removed all CocoaLumberjack files directly included in repo in `Vendor/CocoaLumberjack` and added them as subrepository [CocoaLumberjack](https://github.com/robbiehanson/CocoaLumberjack) to the same directory.

It now contains the latest changes including `dispach_get_current_queue` deprecation warning fix.