cppcheck: suppress noConstrucotor in OTLog and OTDataFolder

We do not want to clean them up since they'll be rewritten
in the short therm anyway.
cppcheck: check always with including the headers
travis: check format before cppcheck

cppcheck can take a long time since it is using the header files
for checking. Therefore, we want to check formatting first because
it is much faster.
Merge pull request #58 from toxeus/cppcheck

cppcheck: include headers in wrapper