Fix misc. errors

lib/phlexite/router.rb

@@ -10,10 +10,13 @@ class Phlexite::Router
   end
 
   def page(out_path, component)
-    File::write(full_out_path(out_path), component.call)
+    out = full_out_path(out_path)
+    system("mkdir -p #{File::dirname(out)}")
+    File::write(out, component.call)
   end
 
 private
+
   def full_out_path(out_path)
     File::join(@site.build_dir, @site.base_url, @base, out_path)
   end

lib/phlexite/site.rb

@@ -7,7 +7,8 @@ class Phlexite::Site < Phlexite::Router
 
   def initialize
     super("/", self)
-    base_url = "/"
+    @build_dir = "_build"
+    @base_url = "/"
     yield self
   end
 end