Fix the STK_CTRL to the STK_CSR library change.
[locm3] Use the new clock-enabling mechanisms in locm3.
Add support for LPC11U14 (tested) and related U-series microcontrollers (untested).
Unwind hardfaults in dual-stack mode.
Nordic nRF51 series support
Merge pull request #44 from miek/nrf51

Nordic nRF51 series support
Updated libopencm3.  Fixes broken bootloader, issue #43.