Added 'application/vnd.ms-office' MIME for ppt

An export from Apple's Numbers to .ppt gives a MIME of application/vnd.ms-office
diff --git a/application/config/mimes.php b/application/config/mimes.php
index 8123557..0723e6f 100644
--- a/application/config/mimes.php
+++ b/application/config/mimes.php
@@ -58,7 +58,7 @@
 	'smil'	=>	'application/smil',
 	'mif'	=>	'application/vnd.mif',
 	'xls'	=>	array('application/vnd.ms-excel', 'application/msexcel', 'application/x-msexcel', 'application/x-ms-excel', 'application/x-excel', 'application/x-dos_ms_excel', 'application/xls', 'application/x-xls', 'application/excel', 'application/download', 'application/vnd.ms-office', 'application/msword'),
-	'ppt'	=>	array('application/powerpoint', 'application/vnd.ms-powerpoint'),
+	'ppt'	=>	array('application/powerpoint', 'application/vnd.ms-powerpoint', 'application/vnd.ms-office'),
 	'pptx'	=> 	array('application/vnd.openxmlformats-officedocument.presentationml.presentation', 'application/x-zip', 'application/zip'),
 	'wbxml'	=>	'application/wbxml',
 	'wmlc'	=>	'application/wmlc',
@@ -178,4 +178,4 @@
 );
 
 /* End of file mimes.php */
-/* Location: ./application/config/mimes.php */
\ No newline at end of file
+/* Location: ./application/config/mimes.php */