Ability to config layout and content dir via cli
Ability to config layout and content dir via cli

fixes spf13/hugo#1598

fedelibre/hugo,soundrussian/hugo,melo/hugo,mayah/hugo,mdhender/hugo,mitchchn/hugo,abourget/hugo,tubo028/hugo,gohugoio/hugo,digitalcraftsman/hugo,Zenithar/hugo,fedelibre/hugo,melo/hugo,digitalcraftsman/hugo,mdhender/hugo,vbatoufflet/hugo,bogem/hugo,anthonyfok/hugo,jygastaud/hugo,anthonyfok/hugo,anthonyfok/hugo,mayah/hugo,jygastaud/hugo,ffrizzo/hugo,soundrussian/hugo,tischda/hugo,tischda/hugo,mdhender/hugo,ffrizzo/hugo,Zenithar/hugo,gohugoio/hugo,MarkDBlackwell/hugo,bogem/hugo,mdhender/hugo,abourget/hugo,MarkDBlackwell/hugo,mitchchn/hugo,gohugoio/hugo,fedelibre/hugo,tubo028/hugo,vbatoufflet/hugo,fedelibre/hugo