python-yieldfrom: new package

A backport of the `yield from` semantic from Python 3.x to Python 2.7.
Can be useful for both host and target packages.

Signed-off-by: Asaf Kahlon <asafka7@gmail.com>
Reviewed-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
diff --git a/DEVELOPERS b/DEVELOPERS
index d6eb24a..38e727e 100644
--- a/DEVELOPERS
+++ b/DEVELOPERS
@@ -185,6 +185,7 @@
 
 N:	Asaf Kahlon <asafka7@gmail.com>
 F:	package/python-jsonmodels/
+F:	package/python-yieldfrom/
 
 N:	Ash Charles <ash.charles@savoirfairelinux.com>
 F:	package/pru-software-support/