Feature/toggle buffering (#3)

This PR adds the property disableBuffering: boolean for android. The PR was initally created as a personal fork and referenced in crunchyroll/vilos#1227

also updated RNVLoadControl constructor and method to reflect new ExoPlayer.LoadControl api

related ticket: https://jira.tenkasu.net/browse/VEX-3776

Video.js

@@ -470,6 +470,7 @@ Video.propTypes = {
   ignoreSilentSwitch: PropTypes.oneOf(['ignore', 'obey']),
   reportBandwidth: PropTypes.bool,
   disableFocus: PropTypes.bool,
+  disableBuffering: PropTypes.bool,
   controls: PropTypes.bool,
   audioOnly: PropTypes.bool,
   currentTime: PropTypes.number,