add tiff decoding to ned.

Reference: /n/atom/patch/applied2013/nedtif
Date: Mon Aug  5 22:49:01 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/upas/ned/nedmail.c	Mon Aug  5 22:48:53 2013
+++ /sys/src/cmd/upas/ned/nedmail.c	Mon Aug  5 22:48:54 2013
@@ -70,6 +70,7 @@
 	{ "image/jpeg",			"jpg",	0,	"image"	},
 	{ "image/gif",			"gif",	0,	"image"	},
 	{ "image/png",			"png",	0,	"image"	},
+	{ "image/tiff",			"tif",	0,	"image"	},
 	{ "application/pdf",		"pdf",	0,	"postscript"	},
 	{ "application/postscript",		"ps",	0,	"postscript"	},
 	{ "application/vnd.openxmlformats-officedocument.wordprocessingml.document",		"docx",	0,	"docx"	},