Add YUI at version 2.8.1 with updating instructions

yui/README

@@ -0,0 +1,21 @@
+CURRENT INFO
+------------
+YUI 2.8.1
+
+UPDATING
+--------
+$ sh refresh_upstream.sh
+$ git commit -m "Updated upstream to YUI <VERSION_NUMBER>" upstream
+
+$ sh refresh_modified.sh
+  # Examine what's in modified and make sure that we only add files
+  # here that we want to go into Gallery3.  Anything that we don't
+  # want should get added to the filters in refresh_modified.sh and
+  # run it again.
+$ git commit -m "Updated upstream to YUI <VERSION_NUMBER>" modified
+$ cp modified/lib/* ../../gallery3/yui
+$ git push
+
+$ cd ../../gallery3
+$ git commit -m "Updated YUI to <VERSION_NUMBER>" lib
+

yui/refresh_modified.sh

@@ -0,0 +1,7 @@
+NAME=yui_2.8.1
+
+rm -rf modified
+mkdir -p modified/lib/yui
+unzip -q -o -j upstream/$NAME.zip -d modified/lib/yui yui/build/base/base-min.css
+unzip -q -o -j upstream/$NAME.zip -d modified/lib/yui yui/build/reset-fonts-grids/reset-fonts-grids.css
+git add modified

yui/refresh_upstream.sh

@@ -0,0 +1,5 @@
+BASE=yui_2.8.1
+PACKAGE=http://yuilibrary.com/downloads/yui2/$BASE.zip
+
+wget -q -O- $PACKAGE > upstream/$BASE.zip
+git add upstream