Add configs for cursor images (`.cur`)

Apply all the configs used for `.ico` files to `.cur` files as the two
image formats are almost identical.

The MIME type for the `.cur` file doesn't matter as browsers seem to
sniff the content. However, `image/x-icon` is specified because it's
the one usually used for `.ico` file and because it's shorther then the
other frequentlly used one (`image/vnd.microsoft.icon`), making the
header size smaller.

See also:
* http://en.wikipedia.org/wiki/ICO_%28file_format%29
* http://msdn.microsoft.com/en-us/library/windows/desktop/ms648007%28v=vs.85%29.aspx

Close: #5.

CHANGELOG.md

@@ -1 +1,3 @@
 ### HEAD
+
+* Add configurations for cursor images (`.cur`).

conf/expires.conf

@@ -21,7 +21,7 @@ location ~* \.(?:rss|atom)$ {
 }
 
 # Media: images, icons, video, audio, HTC
-location ~* \.(?:jpg|jpeg|gif|png|ico|gz|svg|svgz|mp4|ogg|ogv|webm|htc)$ {
+location ~* \.(?:jpg|jpeg|gif|png|ico|cur|gz|svg|svgz|mp4|ogg|ogv|webm|htc)$ {
   expires 1M;
   access_log off;
   add_header Cache-Control "public";

mime.types

@@ -16,7 +16,7 @@ types {
   image/tiff                            tif tiff;
   image/vnd.wap.wbmp                    wbmp;
   image/webp                            webp;
-  image/x-icon                          ico;
+  image/x-icon                          ico cur;
   image/x-jng                           jng;
 
 # JavaScript