[SQUASH ME] just form fix.
[SQUASH ME] removed driver out of makefile from stm32f4discovery board
[SQUASH ME] set the delay between spi-calls to zero
[SQUASH ME] removed unnecessary stuff from tests makefile
[SQUASH ME] remodev DISABLE_MODULE auto_init and vtimer_init in applicatin code
[SQUASH ME] added defines in main.c for used spi port and gpio pins
[SQUASH ME] add error checkoing for spi initialization in nrf24l01p init function