Add support for emojione

test/test_app.rb

@@ -707,6 +707,18 @@ context "Frontend with lotr" do
     assert_match /not so big smelly creatures/, last_response.body
   end
 
+  test "existing emoji" do
+    get "/emoji/heart"
+    assert_equal 200, last_response.status
+    assert_equal 'image/png', last_response.headers['Content-Type']
+    assert_equal [137, 80, 78, 71, 13, 10, 26, 10], last_response.body.each_byte.to_a[0..7]
+  end
+
+  test "missing emoji" do
+    get "/emoji/oggy_was_here"
+    assert_equal 404, last_response.status
+  end
+
   def app
     Precious::App
   end