Merge pull request #7068 from haukepetersen/add_tool_bossa

Makefile.include

boards/arduino-due/Makefile.include

boards/arduino-due/dist/bossac

boards/arduino-due/dist/bossac_osx

boards/arduino-due/dist/flash.sh

boards/arduino-mkr1000/Makefile.include

boards/arduino-mkr1000/dist/bossac

boards/arduino-mkr1000/dist/bossac_osx

boards/arduino-mkr1000/dist/flash.sh

boards/udoo/Makefile.include

boards/udoo/dist/bossac_udoo

boards/udoo/dist/bossac_udoo_osx

dist/tools/bossa/.gitignore

dist/tools/bossa/Makefile

makefiles/tools/bossa.inc.mk

makefiles/tools/targets.inc.mk