This places all security subscriptions within a universes
Subscriptions generated via calls to AddSecurity are place in a UserDefinedUniverse
UserDefinedUniverse will serve up a predetermined list of symbols on a requested interval
LiveTradingDataFeed - reworked custom enumerators to use RefreshEnumerator as wrapper for rate limitting
Maybe an event handler isn't the best way to do this, possibly
initializing the data feed with the universe selection instance
would be better, leaving as is for now
quant1729