Description:
------------
While I can create a file, write to it, close it, and delete it via unlink, I 
can't delete a file created by the buildFromDirectory function of PharData. I 
suspect that the file has been left open.

Test script:
---------------
<?php

$file = uniqid().".txt"; /// Demo: Script can create and delete a file (if properly closed) normally
if( !($f = fopen($file, 'w')) ) echo "Could not open $file <br />\n";
if( !fwrite($f, 'test') )       echo "Could not write to $file <br />\n";
if( !fclose($f) )               echo "Could not close $file <br />\n";
if( !unlink($file) )            echo "Could not delete $file <br />\n";

if( !is_dir( $dir = dirname(__FILE__) . '/phartest' ) ) { /// Create test directory for PharData
    mkdir( dirname(__FILE__) . '/phartest' );
    for($i = 0; $i < 3; $i++) { $f = fopen($dir . "/file$i.txt", 'w'); fwrite($f, $i); fclose($f); };
}

$file2 = uniqid().".zip"; /// Create test archive in the same directory as the demo file
$phar = new PharData($file2);
if( $phar->buildFromDirectory($dir) )
    if(!unlink($file2)) /// Did phar close the file? Can we delete it?
        echo "Could not delete $file2!";
?>

Expected result:
----------------
I expect that the call to unlink($file2) will delete the newly created archive 
(with filename $file2)

Actual result:
--------------
Warning: unlink(<$file2>): Permission denied in C:\htdocs\phartest.php on line 17 
Could not delete <$file2>!