Create ErrorManager util to get MediaErrorCode & MediaErrorMessage
Remove switch from _errorHandler and use ErrorManager util instead
Fix bug : dispatch MediaErrorEvent on the _loadTrait (see OSMF F4MLoader class)
Bind also HLS error within HLSMediaElement (see OSMF LightweightvideoElement class)
Merge pull request #38 from MyArcane/osmf-error-handling-fixes

OSMF error handling fixes