remove self delegate from presentAlertWithTitle to avoid crash when alert is dismissed after streamer's dealloc
removed direct usage of presentAlertWithTitle; now presentAlertWithTitle is only called thru failWithError; also added relevant code error for AS_FILE_STREAM_SET_PROPERTY_FAILED
added missing code error for AS_FILE_STREAM_SET_PROPERTY_FAILED
added isAborted method to represent the condition state==AS_STOPPING && stopReason==AS_STOPPING_ERROR
added shouldDisplayAlertOnError flag to control alert display on failure
Use the URL scheme instead of reading the URL string prefix.
Merge branch 'master' of https://github.com/sdesimone/AudioStreamer