doc: added The Go image package article

Orignally published on The Go Programming Language, September 21, 2011.

http://blog.golang.org/2011/09/go-image-package.html

Update #2547

R=adg, nigeltao
CC=golang-dev
https://golang.org/cl/5933049
diff --git a/doc/progs/run b/doc/progs/run
index 8348a33..92c8da5 100755
--- a/doc/progs/run
+++ b/doc/progs/run
@@ -59,7 +59,16 @@
 	json5
 "
 
-all=$(echo $defer_panic_recover $effective_go $error_handling $law_of_reflection $c_go_cgo $timeout $gobs $json slices go1)
+image_package="
+	image_package1
+	image_package2
+	image_package3
+	image_package4
+	image_package5
+	image_package6
+"
+
+all=$(echo $defer_panic_recover $effective_go $error_handling $law_of_reflection $c_go_cgo $timeout $gobs $json $image_package slices go1)
 
 for i in $all; do
 	go build $i.go
@@ -87,9 +96,17 @@
 testit go1 '^Christmas is a holiday: true Sleeping for 0.123s.*go1.go already exists$'
 
 testit interface2 "^type: float64$"
+
 testit json1 "^$"
 testit json2 "the reciprocal of i is"
 testit json3 "Age is int 6"
 testit json4 "^$"
 
+testit image_package1 "^X is 2 Y is 1$"
+testit image_package2 "^3 4 false$"
+testit image_package3 "^3 4 true$"
+testit image_package4 "^image.Point{X:2, Y:1}$"
+testit image_package5 "^{255 0 0 255}$"
+testit image_package6 "^8 4 true$"
+
 rm -f $all "$TMPFILE"