Implement Page#footer and display footer in frontend.

test/examples/lotr.git/objects/0e/d8cbe0a25235bd867e65193c7d837c66b328ef

@@ -0,0 +1,3 @@
+x
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+MÀ£â¸÷¯Ï�íã¿ÏÛ¬ÖGžó©7UÀ…fò	=Q$Ü2—Ä»²�Æ%ϼEÜue
+î·4=:dx–XÔ§¢k	1`Î"Ä™Ï(iôÄ•¿þc

test/examples/lotr.git/refs/heads/master

@@ -1 +1 @@
-94523d7ae48aeba575099dd12926420d8fd0425d
+0ed8cbe0a25235bd867e65193c7d837c66b328ef

test/test_page.rb

@@ -80,4 +80,16 @@ context "Page" do
     page = @wiki.page('Eye Of Sauron')
     assert_equal "Eye Of Sauron", page.title
   end
+
+  test "top level footer" do
+    footer = @wiki.page('Home').footer
+    assert_equal 'Lord of the Rings wiki', footer.raw_data
+    assert_equal '_Footer.md', footer.path
+  end
+
+  test "nested footer" do
+    footer = @wiki.page('Eye Of Sauron').footer
+    assert_equal "Ones does not simply **walk** into Mordor!\n", footer.raw_data
+    assert_equal "Mordor/_Footer.md", footer.path
+  end
 end