Fix / refactored - Youtube url was parsed incorrectly

fix-refactor/youtube-video-block-embed-urls

##### Youtube url was parsed incorrectly so some type of urls resulted to an incorrect path. #####

- New method for parsing youtube url
- `Type` attribute has been removed and `allowfullscreen` added as suggested by youtube. 
- `wmode` parameter is removed from iframe url.
- `view.php` has been cleaned up.

##### Some examples for iframe url before: #####
<table>
  <tr>
    <td>http://www.youtube.com/embed/VIDEO_ID</td>
    <td>http://www.youtube.com/embed//?wmode=transparent</td>
  </tr>
  <tr>
    <td>http://youtu.be/VIDEO_ID</td>
    <td>http://www.youtube.com/embed//VIDEO_ID/?wmode=transparent</td>
  </tr>
  <tr>
    <td>http://www.youtube.com/v/VIDEO_ID</td>
    <td>http://www.youtube.com/embed//?wmode=transparent</td>
  </tr>
  <tr>
    <td>http://www.youtube.com/watch?v=VIDEO_ID</td>
    <td>http://www.youtube.com/embed/VIDEO_ID/?wmode=transparent</td>
  </tr>
</table>

##### Examples with new method:#####
http://3v4l.org/pHpPk