Added a function for the slave to print received data.
cpu/stm32f4: optimized GPIO driver implementation
SQUASH: cpu: fixed some typos
SQUASH: cpu/f4: changed order of irq enabling seq
added board airfy beacon
netdev: clarify documentation of netdev_driver_t::get_option()
Merge pull request #1928 from authmillenon/netdev-fix-doc

netdev: clarify documentation of netdev_driver_t::get_option()
Revert "cpu/cc2538: sbrk() checks if the requested memory is really available."

This reverts commit 81dea364a5b372ad1625181eff710c095420735c.
cpu/cc2538: Enable the CC2538's more compact alternate interrupt mapping.
Merge pull request #1930 from locicontrols/cc2538-altmap

cpu/cc2538: Enable the CC2538's more compact alternate interrupt mapping.
Merge pull request #1896 from mehlis/add_board_airfy_beacon

added board airfy beacon
cpu/stm32f1: fixes for the cpuid driver
cpu/nrf51822: changed ISR stack size to 512 byte
drivers/at86rf231: change to PLL_ON to change address
drivers/at86rf231: print raw packet when DEBUG_ENABLED
drivers/at86rf231: frame_type has to be set by upper layers
examples/default: print 16bit addresses
shell/transceiver: set 16 bit addresses and frame type
added new board f4vi1
Merge pull request #1931 from thomaseichinger/stm32f1-cpuid

cpu/stm32f1: fixes for the cpuid driver