increase mongo cache size

services/spelling/app/coffee/MongoCache.coffee

@@ -1,7 +1,7 @@
 LRU = require("lru-cache")
 cacheOpts = 
-	max: 5000
-	maxAge: 1000 * 60 * 60
+	max: 15000
+	maxAge: 1000 * 60 * 60 * 10
 
 cache = LRU(cacheOpts)