Handling MP3 files #734

The code does not make sense to me:
````php
$file = \OC\Files\Filesystem::getView()->getAbsolutePath($path); // relative to www root!
$data = @$this->getID3->analyze('oc://' . $file);                // analyze() cannot recognize 'oc://' prefix
````
I corrected it to (I double checked - it works for me):
````php
$file = \OC\Files\Filesystem::getLocalFile($path); // get local file name from $path
$data = @$this->getID3->analyze($file);            // analyze that file
````