add build scripts/configs
ignore compiled outputs, checksums, backup files
tweak/personalize version string
boot.c: skip boot menu, boot timeout if only one boot device

Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
boot.c: fix boot text for USB devices

Currently, booting from a USB device displays the same text as
booting from a hard disk ('Booting from hard disk').
Identify USB devices based on description string and display
correct text when booting

Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
update config, build scripts
update output filename to reflect suitability for all
Haswell-based ChromeOS devices.
copy output file to coreboot working dir
updated/renamed build scripts
Revert to: use CBFS files to set boot menu key, txt