Fixing file deletion issue in windows

where unlink() cannot delete files that have open
file handles.
Fixes #376

cake/libs/file.php

@@ -290,6 +290,10 @@ function close() {
  */
 	function delete() {
 		clearstatcache();
+		if (is_resource($this->handle)) {
+			fclose($this->handle);
+			$this->handle = null;
+		}
 		if ($this->exists()) {
 			return unlink($this->path);
 		}

cake/tests/cases/libs/file.test.php

@@ -395,7 +395,7 @@ function testAppend() {
 	function testDelete() {
 		if (!$tmpFile = $this->_getTmpFile()) {
 			return false;
-		};
+		}
 
 		if (!file_exists($tmpFile)) {
 			touch($tmpFile);
@@ -411,6 +411,24 @@ function testDelete() {
 		$this->assertFalse($result);
 	}
 
+/**
+ * Windows has issues unlinking files if there are
+ * active filehandles open.
+ *
+ * @return void
+ */
+	function testDeleteAfterRead() {
+		if (!$tmpFile = $this->_getTmpFile()) {
+			return false;
+		}
+		if (!file_exists($tmpFile)) {
+			touch($tmpFile);
+		}
+		$file =& new File($tmpFile);
+		$file->read();
+		$this->assertTrue($file->delete());
+	}
+
 /**
  * testCopy method
  *