Reads data files inside data/ and makes data available in .Site.Data

Fixes #476.

Conflicts:
	hugolib/site.go

commands/new.go

@@ -130,6 +130,7 @@ func NewSite(cmd *cobra.Command, args []string) {
 	mkdir(createpath, "content")
 	mkdir(createpath, "archetypes")
 	mkdir(createpath, "static")
+	mkdir(createpath, "data")
 
 	createConfig(createpath, configFormat)
 }