robohash: adding a robot-based hashing tool.

diff --git a/extra/robohash/authors.txt b/extra/robohash/authors.txt
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+John Benediktsson

diff --git a/extra/robohash/robohash.factor b/extra/robohash/robohash.factor
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+++ b/extra/robohash/robohash.factor
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+! Copyright (C) 2011 John Benediktsson.
+! See http://factorcode.org/license.txt for BSD license.
+
+USING: images.http kernel sequences urls urls.encoding ;
+
+IN: robohash
+
+<PRIVATE
+
+: robohash-url ( str -- url )
+    url-encode "http://robohash.org/" prepend >url ;
+
+: (robohash) ( str type -- image )
+    [ robohash-url ] [ "set" set-query-param ] bi*
+    load-http-image ;
+
+PRIVATE>
+
+: robohash1 ( str -- image ) "set1" (robohash) ;
+
+: robohash2 ( str -- image ) "set2" (robohash) ;
+
+: robohash3 ( str -- image ) "set3" (robohash) ;

diff --git a/extra/robohash/summary.txt b/extra/robohash/summary.txt
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+Robohash!