Remove all timeout callbacks once the connection is reported as complete.

Was hitting a double completion callback bug if attempting to load a File URI.
One for the uri handler failure, and again for timeout.
AsyncHttpServerResponse.sendStream: Fix stream closing
Merge branch 'master' of https://github.com/koush/AndroidAsync

# By Koushik Dutta
# Via Koushik Dutta
* 'master' of https://github.com/koush/AndroidAsync:
  AsyncHttpServerResponse.sendStream: Fix stream closing
  Remove all timeout callbacks once the connection is reported as complete.