added support for deleting tables: del f[tag]


git-svn-id: svn://svn.code.sf.net/p/fonttools/code/trunk@201 4cde692c-a291-49d1-8350-778aa11640f8
diff --git a/Lib/fontTools/ttLib/sfnt.py b/Lib/fontTools/ttLib/sfnt.py
index da3f37e..8e112db 100644
--- a/Lib/fontTools/ttLib/sfnt.py
+++ b/Lib/fontTools/ttLib/sfnt.py
@@ -60,6 +60,9 @@
 				print "bad checksum for '%s' table" % tag
 		return data
 	
+	def __delitem__(self, tag):
+		del self.tables[tag]
+	
 	def close(self):
 		self.file.close()