added comments to Gemfile for code review
added comments to Gemfile for code review

NikitaAvvakumov/osra,AgileVentures/osra,guangfanxu/osra,robbiejackson/osra,b264/osra,SergiosLen/osra,AgileVentures/osra,gmunumel/osra,evo2013/osra,b264/osra,SergiosLen/osra,robbiejackson/osra,SergiosLen/osra,AgileVentures/osra,motasem-salem/osra,razorcd/osra,ZmagoD/osra,NikitaAvvakumov/osra,gmunumel/osra,motasem-salem/osra,gmunumel/osra,razorcd/osra,PurityControl/osra,ZmagoD/osra,PurityControl/osra,razorcd/osra,b264/osra,jmorcate/osra,robbiejackson/osra,NikitaAvvakumov/osra,ZmagoD/osra,PurityControl/osra,evo2013/osra,motasem-salem/osra,guangfanxu/osra,guangfanxu/osra,jmorcate/osra,jmorcate/osra