'Auto select nearest datacenter region' fix and the new 'Capacity' feature in virtual classroom

The previously reported issue of all the traffic going to Dallas, TX location when using 'auto select nearest location' (isRegion=0 API call) feature is now fixed. When you schedule a live class and leave the default isRegion=0 option, it will now assign class to the nearest datacenter location and/or takes the least congestion free network path in to consideration.

Furthermore, we've improved this feature to include 'capacity' in to consideration. When you schedule a class with high number of attendees, the built-in 'capacity' tool will find the best performing servers from our cluster pool and reserve it for the class to offer the best possible performance.