cpu/sam3x8e: added random number generator driver
boards/arduino-due: enabled RNG driver
test/periph_random: added test for RNG driver
Merge pull request #1294 from haukepetersen/add_arduinodue_rng_driver

cpu: Add random number generator driver for the SAM3X8E
tests: enable cppcheck for PR in travis
SQASHME: move to script
SQUASHME: unify files to check
SQUASHME: make it possible to pass options