Bootloader

[Graynomad]

USB bootloader for G55

[aethaniel]

@Graynomad, as seen here: https://github.com/aethaniel/ExperimentalCore-sam/wiki#bootloader, this is planned.

OpenBLT port is on hold at the moment due to the efforts on the whole port.

check the specs: http://www.feaser.com/openblt/doku.php?id=homepage