Renamed streamError

Renamed streamError event to error.
Merge pull request #50 from LingoLasse/errors

Renamed 'streamError' event to 'error'
Redirect auth errors

Auth errors are now dispatched as the default 401 RTSP error instead of
a custom Locomote error.
Added info about error messages to read me
Formatting of error section in Read me
Merge pull request #52 from LingoLasse/autherrors

Redirect auth errors
Merge pull request #54 from LingoLasse/errorinfo

Updated Read me with info about errors
README: example from `streamError` to `error`
Error Management

Error Management for Audio.
Changed error 807 to RTSP error code (401)
Changed event names

Changed event names to audioTransmitStarted and audioTransmitStopped
Fixed wrong event name
Added audioTransmitStopped event to error 813