remove old lib helper references

index.js

 module.exports = {
-    // These need love
-    IfNotSeen: require('./lib/after'),
-    Since: require('./lib/since'),
-
 	Digest: require('./lib/digest'),
     Timeseries: {
         Counter: require('./lib/timeseries/counter'),
@@ -17,14 +13,6 @@ module.exports = {
 
     syslog: require('./lib/syslog'),
 
-/*
-    Throttle: {
-        // The API for these is inconsistent
-        InMemory: require('./lib/throttle/memory')
-        //InRedis: require('./lib/throttle/redis')
-    },
-*/
-
     watchFile: require('./lib/input/file-watcher'),
 
     createMessage: function(payload, source, sourceFile, remoteAddress, localAddress, localPort) {