remove space line
spaces instead of tabs
deleted unused defines
edited copyrigth header
[SQUASH ME] added fixed speed values
reduced register setting code; enabling in initialisation function
changed SPI_port to spi_port
Merge branch 'add_driver_spi_if' of https://github.com/haukepetersen/RIOT into stm32f4_spi_driver
drivers: Initial import of SPI low-level driver IF
drivers: fixes to the SPI low-level interface
driver: updated SPI driver interface
[SQUASH ME] added fixed speed values
[SQUASH ME] removed UNDEFINED from device list
[SQUASH ME] fixed signature of spi_transfer_reg()
[SQUASH ME] added begin_transaction, fixed doc
Merge branch 'add_driver_spi_if' of https://github.com/haukepetersen/RIOT into stm32f4_spi_driver

Conflicts:
	drivers/include/periph/spi.h
adjasted driver functions to last spi interface merge
edited AF register initialisation
edited the way to give return in spi_transfer_reg
ready for pushing intermediate state