added way of clearing cache (closes #29)

clearcache.js

@@ -0,0 +1,18 @@
+/* 
+	This flushes all the keys in redistogo instance
+
+	local:
+	REDISTOGO_URL=the_redis_url node flushcache.js 
+
+	heroku:
+	heroku run node flushcache.js --app aidview
+*/
+
+var redis = require('redis-url').createClient(process.env.REDISTOGO_URL);
+
+console.log("running flushdb on redis to go");
+
+redis.flushdb(function(){
+	console.log("complete");
+	process.exit(0);
+});

readme.md

@@ -86,6 +86,10 @@ And to use redis locally
 
 …Just now - there isn't a good option for cache expiry,  but removing and adding the add-on should do the trick.
 
+There is a script that will expire the redis cache, this can be run on heroku using:
+
+    heroku run node clearcache.js --app aidview
+
 
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