(red) Write failing controller test => UserHomePagesController#show redirect if
not signed in
(red) Write failing routing test => SignInsController should route GET
/sign_ins/new to/from {:controller=>"sign_ins", :action=>"new"}
(green) Make routing test pass => SignInsController should route GET
/sign_ins/new to/from {:controller=>"sign_ins", :action=>"new"}