rebar_log: use defines for log level numbers
rebar_log: use defines for log level numbers

jacktang/rebar,choptastic/rebar,jacktang/rebar,benoitc/rebar3,jacktang/rebar,lpgauth/rebar,CMoH/rebar,syl20bnr/rebar,RubberCthulhu/rebar,shkumagai/rebar,macintux/rebar,kellymclaughlin/rebar3,scatterbrain/rebar,csyangchen/rebar,processone/rebar3,paulo-ferraz-oliveira/rebar,sile/rebar3,zugolosian/rebar3,SiDen/rebar,evnix/rebar,erlang/rebar3,evnix/rebar,sile/rebar3,CMoH/rebar,rebar/rebar,platinumthinker/rebar,evnix/rebar,jbalint/rebar3,lrascao/rebar,SiDen/rebar,K2InformaticsGmbH/rebar,K2InformaticsGmbH/rebar,lrascao/rebar,rebar/rebar3,cloudant/couchdb-rebar,norton/rebar,platinumthinker/rebar,choptastic/rebar,lrascao/rebar,GabrielNicolasAvellaneda/rebar,K2InformaticsGmbH/rebar,zugolosian/rebar3,walrusVision/rebar3,beni55/rebar,project-fifo/rebar3,matwey/rebar,beni55/rebar,fabiankrol/rebar3,linearregression/rebar3,lrascao/rebar,macintux/rebar,lpgauth/rebar,lrascao/rebar,jbalint/rebar3,cloudant/couchdb-rebar,scatterbrain/rebar,syl20bnr/rebar,apache/couchdb-rebar,blt/rebar3,matwey/rebar,norton/rebar,dcarastan/rebar,apache/couchdb-rebar,fabiankrol/rebar3,csyangchen/rebar,oubiwann/rebar,bsmr-erlang/rebar,oubiwann/rebar,saleyn/rebar3,csyangchen/rebar,benoitc/rebar3,norton/rebar,processone/rebar3,heroku/rebar,norton/rebar3,fauxsoup/rebar3,shkumagai/rebar,matwey/rebar,choptastic/rebar,macintux/rebar,K2InformaticsGmbH/rebar,djnym/rebar3,surik/rebar3,matwey/rebar,GabrielNicolasAvellaneda/rebar,blt/rebar3,dcarastan/rebar,oubiwann/rebar,linearregression/rebar3,dcarastan/rebar,platinumthinker/rebar,surik/rebar3,GabrielNicolasAvellaneda/rebar,lrascao/rebar3,apache/couchdb-rebar,CMoH/rebar,rebar/rebar,rebar/rebar3,norton/rebar,scatterbrain/rebar,beni55/rebar,fishcakez/rebar3,syl20bnr/rebar,bsmr-erlang/rebar,walrusVision/rebar3,ferd/rebar3,bsmr-erlang/rebar,project-fifo/rebar3,cloudant/couchdb-rebar,rebar/rebar,lpgauth/rebar,K2InformaticsGmbH/rebar,paulo-ferraz-oliveira/rebar,RubberCthulhu/rebar,tsloughter/rebar3,fauxsoup/rebar3,SiDen/rebar,vladdu/rebar3,paulo-ferraz-oliveira/rebar,shkumagai/rebar,bsmr-erlang/rebar,matwey/rebar,heroku/rebar