* AssemblyInfo.cs: update to version 1.0.2

* WebSocket10.cs: Correct a bug in close packets. Add support for
  continuation frame. Correct a bug where data were dropped when input
  rate was too high.

* WebSocketHandler.cs: nothing

* WebSocketHandlerCollection.cs: Add IEnumerable<T> interface for
  WebSocketHandlerCollection

* changelog: update changelog