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`
Renumbered errors

Renumbered all error messages.
Added ErrorManager import