Major fixes around log()
Major fixes around log()

lisong521/easyloggingpp,arvidsson/easyloggingpp,simonhang/easyloggingpp,lisong521/easyloggingpp,dreal-deps/easyloggingpp,simonhang/easyloggingpp,simonhang/easyloggingpp,spthaolt/easyloggingpp,blankme/easyloggingpp,utiasASRL/easyloggingpp,spqr33/easyloggingpp,blankme/easyloggingpp,spthaolt/easyloggingpp,lisong521/easyloggingpp,utiasASRL/easyloggingpp,chenmusun/easyloggingpp,spqr33/easyloggingpp,dreal-deps/easyloggingpp,chenmusun/easyloggingpp,chenmusun/easyloggingpp,hellowshinobu/easyloggingpp,arvidsson/easyloggingpp,utiasASRL/easyloggingpp,hellowshinobu/easyloggingpp,arvidsson/easyloggingpp,dreal-deps/easyloggingpp,blankme/easyloggingpp,hellowshinobu/easyloggingpp,spqr33/easyloggingpp,spthaolt/easyloggingpp