Fix cover print truncation when coverage is 100%
Fix cover print truncation when coverage is 100%

When the option {cover_print_enabled, true} is set and that the code
coverage is 100%, the '%' will end up being truncated.

This patch makes it so that the truncation happens at 4 a characters
width so that instead of the following printouts:

    some_mod  : 99%
    some_other: 100

We instead show:

    some_mod  :  99%
    some_other: 100%

This solves issue #331 as reported by @lispking and @NineFX.

shkumagai/rebar,macintux/rebar,scatterbrain/rebar,shkumagai/rebar,platinumthinker/rebar,apache/couchdb-rebar,lrascao/rebar,lpgauth/rebar,apache/couchdb-rebar,matwey/rebar,platinumthinker/rebar,dcarastan/rebar,syl20bnr/rebar,jacktang/rebar,shkumagai/rebar,matwey/rebar,beni55/rebar,norton/rebar,lrascao/rebar,oubiwann/rebar,K2InformaticsGmbH/rebar,RubberCthulhu/rebar,matwey/rebar,CMoH/rebar,dcarastan/rebar,cloudant/couchdb-rebar,cloudant/couchdb-rebar,lpgauth/rebar,SiDen/rebar,evnix/rebar,bsmr-erlang/rebar,paulo-ferraz-oliveira/rebar,csyangchen/rebar,jacktang/rebar,rebar/rebar,beni55/rebar,bsmr-erlang/rebar,RubberCthulhu/rebar,bsmr-erlang/rebar,csyangchen/rebar,beni55/rebar,rebar/rebar,lrascao/rebar,norton/rebar,oubiwann/rebar,choptastic/rebar,matwey/rebar,K2InformaticsGmbH/rebar,GabrielNicolasAvellaneda/rebar,K2InformaticsGmbH/rebar,csyangchen/rebar,choptastic/rebar,CMoH/rebar,lrascao/rebar,scatterbrain/rebar,bsmr-erlang/rebar,macintux/rebar,syl20bnr/rebar,oubiwann/rebar,macintux/rebar,apache/couchdb-rebar,jacktang/rebar,SiDen/rebar,norton/rebar,platinumthinker/rebar,scatterbrain/rebar,paulo-ferraz-oliveira/rebar,dcarastan/rebar,cloudant/couchdb-rebar,K2InformaticsGmbH/rebar,SiDen/rebar,CMoH/rebar,norton/rebar,GabrielNicolasAvellaneda/rebar,K2InformaticsGmbH/rebar,syl20bnr/rebar,lrascao/rebar,choptastic/rebar,rebar/rebar,paulo-ferraz-oliveira/rebar,lpgauth/rebar,GabrielNicolasAvellaneda/rebar,evnix/rebar,evnix/rebar,matwey/rebar