MFC from the last few months:

MFC from the last few months:
Note: didn't merge r274331 removing gif/faith on purpose.

r268246 | mr | use mkimg and build into separate directories
r269355 | imp | Fix typo in example script
r269362 | imp | use rm -x on 10 and newer
r269363 | imp | NANO_OBJ shouldn't end with '/'
r269423 | imp | -K to suppress installkernel
r269424 | imp | sort usage
r269425 | imp | sort switch
r269983 | imp | only install bootloader if it exists
r269984 | imp | create_diskimage since it never was $ARCH dependent
r270162 | imp | Add support for -X which instales cross native tools

git-svn-id: svn://svn.freebsd.org/base/stable/10@274561 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f