Map HLS.currentLevel as level

This saves us from having to change IProvider interface with possibly needless currentLevel and nextLevel bindings. This also lowers the boundry for implementing this interface for HTML5 tech.

Author: hparra

src/com/videojs/providers/HLSProvider.as

@@ -544,7 +544,7 @@ package com.videojs.providers{
  */
  public function get level():int
  {
- return _hls['level'];
+ return _hls.currentLevel;
  }
 
  /**
@@ -554,7 +554,7 @@ package com.videojs.providers{
  */
  public function set level(pLevel:int):void
  {
- _hls['level'] = pLevel;
+ _hls.currentLevel = pLevel;
 
  // For reflecting new level from the next segment. Otherwise, new setting is applied only after currently buffered data is gone.
  if (!isNaN(_position) && pLevel != -1) {