Fix AsyncServer.stop
Throw assertion if tap is not found PushParser.
Merge branch 'master' of https://github.com/iNdieboyjeff/AndroidAsync; branch 'master' of https://github.com/koush/AndroidAsync

* 'master' of https://github.com/iNdieboyjeff/AndroidAsync:

# By Koushik Dutta
# Via Koushik Dutta
* 'master' of https://github.com/koush/AndroidAsync:
  Fix AsyncServer.stop Throw assertion if tap is not found PushParser.