Optimize list ops and error reporting in sh/2
Optimize list ops and error reporting in sh/2

RubberCthulhu/rebar,K2InformaticsGmbH/rebar,K2InformaticsGmbH/rebar,choptastic/rebar,lrascao/rebar,K2InformaticsGmbH/rebar,thomasbhatia/rebar,K2InformaticsGmbH/rebar,csyangchen/rebar,dcarastan/rebar,beni55/rebar,lpgauth/rebar,oubiwann/rebar,linearregression/rebar3,oubiwann/rebar,lrascao/rebar,surik/rebar3,dcarastan/rebar,lrascao/rebar,shkumagai/rebar,jacktang/rebar,platinumthinker/rebar,vladdu/rebar3,deadok22/rebar,fauxsoup/rebar3,GabrielNicolasAvellaneda/rebar,fauxsoup/rebar3,shkumagai/rebar,CMoH/rebar,fabiankrol/rebar3,apache/couchdb-rebar,erlang/rebar3,rebar/rebar3,zugolosian/rebar3,evnix/rebar,thomasbhatia/rebar,saleyn/rebar3,syl20bnr/rebar,apache/couchdb-rebar,basho/rebar,fabiankrol/rebar3,SiDen/rebar,thomasbhatia/rebar,norton/rebar,RubberCthulhu/rebar,walrusVision/rebar3,matwey/rebar,jbalint/rebar3,cloudant/couchdb-rebar,wcy123/rebar,GabrielNicolasAvellaneda/rebar,lpgauth/rebar,tsloughter/rebar3,blt/rebar3,csyangchen/rebar,SiDen/rebar,paulo-ferraz-oliveira/rebar,apache/couchdb-rebar,syl20bnr/rebar,K2InformaticsGmbH/rebar,evnix/rebar,choptastic/rebar,scatterbrain/rebar,shkumagai/rebar,matwey/rebar,heroku/rebar,bsmr-erlang/rebar,oubiwann/rebar,linearregression/rebar3,rebar/rebar,kellymclaughlin/rebar3,cloudant/couchdb-rebar,sile/rebar3,djnym/rebar3,benoitc/rebar3,deadok22/rebar,macintux/rebar,scatterbrain/rebar,ferd/rebar3,matwey/rebar,bsmr-erlang/rebar,wcy123/rebar,zugolosian/rebar3,lpgauth/rebar,project-fifo/rebar3,matwey/rebar,matwey/rebar,rebar/rebar,sile/rebar3,surik/rebar3,processone/rebar3,evnix/rebar,lrascao/rebar,project-fifo/rebar3,beni55/rebar-1,processone/rebar3,beni55/rebar-1,dcarastan/rebar,rebar/rebar,beni55/rebar,basho/rebar,lrascao/rebar,blt/rebar3,jacktang/rebar,platinumthinker/rebar,bsmr-erlang/rebar,choptastic/rebar,norton/rebar,CMoH/rebar,walrusVision/rebar3,GabrielNicolasAvellaneda/rebar,norton/rebar,fishcakez/rebar3,jbalint/rebar3,lrascao/rebar3,jacktang/rebar,bsmr-erlang/rebar,csyangchen/rebar,rebar/rebar3,platinumthinker/rebar,beni55/rebar,norton/rebar3,heroku/rebar,macintux/rebar,macintux/rebar,benoitc/rebar3,syl20bnr/rebar,paulo-ferraz-oliveira/rebar,CMoH/rebar,norton/rebar,paulo-ferraz-oliveira/rebar,scatterbrain/rebar,SiDen/rebar,cloudant/couchdb-rebar