Install the uboot build commands in POST_CONFIG, after any
user overrides have been processed.  Otherwise, the
default value of RPI_UBOOT_SRC gets burned into the strategy
commands before the user can change it.
Clarify that board_setup must be first in config.sh
Refactor the uboot setup for RPi to match BeagleBone
Use improved U-Boot organization for PandaBoard too
Create a hook for overriding installkernel
Merge branch 'master' of git://github.com/kientzle/crochet-freebsd