Additional minor refactor in erlcinfo
Additional minor refactor in erlcinfo

- use filelib:last_modified/1 instead of date/0 and time/0 combo
  in source file vertices
- simplify store_erlcinfo/2
- document init_erlcinfo/2

apache/couchdb-rebar,K2InformaticsGmbH/rebar,choptastic/rebar,oubiwann/rebar,evnix/rebar,oubiwann/rebar,matwey/rebar,cloudant/couchdb-rebar,norton/rebar,platinumthinker/rebar,paulo-ferraz-oliveira/rebar,CMoH/rebar,K2InformaticsGmbH/rebar,bsmr-erlang/rebar,csyangchen/rebar,matwey/rebar,evnix/rebar,jacktang/rebar,scatterbrain/rebar,macintux/rebar,norton/rebar,bsmr-erlang/rebar,beni55/rebar,oubiwann/rebar,lpgauth/rebar,evnix/rebar,apache/couchdb-rebar,GabrielNicolasAvellaneda/rebar,K2InformaticsGmbH/rebar,rebar/rebar,bsmr-erlang/rebar,norton/rebar,lpgauth/rebar,bsmr-erlang/rebar,lrascao/rebar,scatterbrain/rebar,paulo-ferraz-oliveira/rebar,csyangchen/rebar,cloudant/couchdb-rebar,GabrielNicolasAvellaneda/rebar,beni55/rebar,GabrielNicolasAvellaneda/rebar,SiDen/rebar,dcarastan/rebar,norton/rebar,CMoH/rebar,cloudant/couchdb-rebar,apache/couchdb-rebar,scatterbrain/rebar,jacktang/rebar,CMoH/rebar,matwey/rebar,matwey/rebar,lpgauth/rebar,lrascao/rebar,jacktang/rebar,rebar/rebar,lrascao/rebar,lrascao/rebar,choptastic/rebar,dcarastan/rebar,platinumthinker/rebar,shkumagai/rebar,K2InformaticsGmbH/rebar,choptastic/rebar,csyangchen/rebar,SiDen/rebar,macintux/rebar,platinumthinker/rebar,K2InformaticsGmbH/rebar,beni55/rebar,SiDen/rebar,dcarastan/rebar,paulo-ferraz-oliveira/rebar,lrascao/rebar,rebar/rebar,macintux/rebar,matwey/rebar,shkumagai/rebar,shkumagai/rebar