board: Initial import of stm32f0discovery
cpu: Initial import of cortex-m0_common
cpu: Initial import of stm32f0
tests/examples: added stm32f0discovery to ignorelists
board - stm32f0discovery: make newlib nano optional
cpu - cortex-m0_common: fixes to thread_arch.c
cpu - stm32f0: added hwtimer_set_absolute
cpu - stm32f0: added UART0 define and fixed stack sizes
drivers: added set_absolute to timer interface