Fix lock pin config
Remove debug stuff
Add sd sync on ejection
Remove delay on start-up
Removing debug print statements
Switch to LUFA's SPI commands in mp3.c
SPI_SendByte is a drop-in replacement for sd_raw_send_byte
Optimize sd_raw_rec_byte
Add sd_raw_ignore_byte (with no return)
Making sd_raw_block stuff available to other files
Better preprocessor ifdefs
Big speedup by using RAM buffer directly
Remove debug statements.