trying to fix travis macos build fail. don't know if this work or not. I don't have mac to test it :)

Small formatting and documentation fixes

Merge fuse and scheme, add mkfs utility, remove old utility

Travis: fix config (on Linux)

With this change, travis will work on Linux at least.

Let root manipulate a fuse-mounted redoxfs vfs.

This (along with a few Makefile changes) solves my issues building on macOS.

New kernel