tests: transformed tests/sha256 into an unittest
sys:net:routing:rpl made the number of routing entries configurable on compile time.
boards,drivers,examples: unset ENABLE_DEBUG
Merge pull request #2181 from phiros/tests_sha256_transform_into_unittest

tests: transformed tests/sha256 into a unittest
Merge pull request #2186 from LudwigOrtmann/disable-debug

boards,drivers,examples: unset ENABLE_DEBUG
Merge pull request #2169 from BytesGalore/rpl_configuarbale_max_routing_entries

sys:net:routing:rpl allow setting the number of routing entries on comile time