Clarify the purpose of --deployment
Clarify the purpose of --deployment

The man page originally explained that `--deployment` is not appropriate for the `test` environment, which is misleading. In a CI environment, you *do* want to use `--deployment`, despite the fact that CI will likely be using `RAILS_ENV=test` when running tests.

This PR clarifies that `--deployment` is for production and CI, and avoids explicitly referencing Rails environment names.
wenderjean/bundler,chef/bundler,elovelan/bundler,roseweixel/bundler,nju520/bundler,wenderjean/bundler,suhastech/bundler,ximus/bundler,asymmetric/bundler,schaary/bundler,anil826/bundler,zhangkuaiji/bundler,simplybusiness/bundler,robinboening/bundler,simplybusiness/bundler,carpodaster/bundler,elovelan/bundler,chulkilee/bundler,pivotal-cf-experimental/bundler,neslom/bundler,frsyuki/bundler,mpapis/bundler,Teino1978-Corp/Teino1978-Corp-bundler,anil826/bundler,bundler/bundler,h4ck3rm1k3/bundler,davydovanton/bundler,frsyuki/bundler,dilumnavanjana/bundler,bronzdoc/bundler,EasonYi/bundler,asymmetric/bundler,tgxworld/bundler,byroot/bundler,Teino1978-Corp/Teino1978-Corp-bundler,jasonkarns/bundler,lmtim/bundler,AiyionPrime/bundler,mdorrance/bundler,agis-/bundler,cstrahan/bundler,chef/bundler,ipmobiletech/bundler,pivotal-cf-experimental/bundler,byroot/bundler,cdwort/bundler,gregkare/bundler,seanlinsley/bundler,asutoshpalai/bundler,nju520/bundler,steved/bundler,tgxworld/bundler,masarakki/bundler,lmtim/bundler,EasonYi/bundler,patvice/bundler,bundler/bundler,EthanK28/bundler,dilumnavanjana/bundler,ximus/bundler,bronzdoc/bundler,Elffers/bundler,seanlinsley/bundler,CorainChicago/bundler,robinboening/bundler,masarakki/bundler,kohgpat/bundler,AiyionPrime/bundler,RochesterinNYC/bundler,steved/bundler,mpapis/bundler,danimashu/bundler,joshsoftware/bundler,zhangkuaiji/bundler,Eric-Guo/bundler,danimashu/bundler,Eric-Guo/bundler,ligi/bundler,PG-kura/bundler,h4ck3rm1k3/bundler,PG-kura/bundler,davydovanton/bundler,kohgpat/bundler,cstrahan/bundler,agis-/bundler,asutoshpalai/bundler,Elffers/bundler,cdwort/bundler,mvz/bundler,mvz/bundler,ligi/bundler,mdorrance/bundler,jasonkarns/bundler,CorainChicago/bundler,jingweno/bundler,philnash/bundler,philnash/bundler,suhastech/bundler,christer155/bundler,christer155/bundler,neslom/bundler,EthanK28/bundler,joshsoftware/bundler,Wirachmat/bundler,patvice/bundler,schaary/bundler,gregkare/bundler,roseweixel/bundler,jingweno/bundler,RochesterinNYC/bundler,ipmobiletech/bundler,Wirachmat/bundler,carpodaster/bundler,chulkilee/bundler