clarified 'now' option on help message for --date
clarified 'now' option on help message for --date

SciRuby/sciruby.com,xiongjungit/octopress-blog,dinomite/octopress,samarpanda/octopress,electronspin/octopress,samarpanda/octopress,SciRuby/sciruby.com,shekarrex/octopress,Hyaena/octopress3,dougbeal/octopress,octopress/octopress,10fish/octopress,electronspin/octopress,taoger/octopress,beni55/octopress,dinomite/octopress,hazzik/octopress,TobiasChe/octopress,shekarrex/octopress,Hyaena/octopress3,beni55/octopress,zachbrowne/octopress,dinomite/octopress,dougbeal/octopress,hazzik/octopress,zachbrowne/octopress,HiWong/octopress,octopress/octopress,HiWong/octopress,taoger/octopress,dinomite/octopress,TobiasChe/octopress,xiongjungit/octopress-blog,SciRuby/sciruby.com