OP-1465 - Update stm32flash repository to https://code.google.com/p/stm32flash/ and fetch a newer version (a358bd1f025d)
OP-1465 - Fix build on windows, force the removal on cleanup
OP-1465 - fixes for some review suggestions
Merge remote-tracking branch 'origin/amorale/OP-1465_update_stm32flash' into next