make: allow tagged RIOT_VERSION
make: `term` depends on `flash`

If you provide both `flash` and `term` as Make goals, then `term` needs
to wait for flash.
ip: check for null before ip_get_next_hop is used
doccheck: grep for all lines with a warning
Merge pull request #2124 from Kijewski/all-flash-term

make: term depends on flash
Merge pull request #1913 from Kijewski/issue-1910

make: allow tagged RIOT_VERSION
Merge pull request #2178 from cgundogan/ip_fix_null_check

ip: check for null before ip_get_next_hop is used
tests: transformed tests/bloom into an unittest
Merge pull request #2182 from phiros/tests_bloom_transform_into_unittest

tests: transformed tests/bloom into an unittest
Merge pull request #2180 from OlegHahm/doccheck_fix_grep_sed

doccheck: grep for all lines with a warning
tools/licenses: add revised 1c-BSD pattern used in utlist
sys/include: Include utlist for simple list operation defines
Merge pull request #2174 from fnack/utlist

sys/include: Add utlist to sys includes
Revert "Revert "Merge remote-tracking branch 'upstream/master'""

This reverts commit 3cccb9e7627083a87683d0a88e2bf44bac0ebf95.
Merge remote-tracking branch 'upstream/master'
created dummy Makefile in sys/lib

otherwise stmf0discovery-diy would not compile