Fix manifest to include sample scripts.

Reviewed in http://codereview.appspot.com/4994041/
diff --git a/MANIFEST.in b/MANIFEST.in
index 7e85b3a..2034f57 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -7,6 +7,9 @@
 recursive-include docs *.html
 recursive-include simplejson *.py *.c
 recursive-include samples *.py *.png *.html *.yaml *.json
+include samples/gtaskqueue_sample/gtaskqueue/gen_appengine_access_token
+include samples/gtaskqueue_sample/gtaskqueue/gtaskqueue
+include samples/gtaskqueue_sample/gtaskqueue/gtaskqueue_puller
 include runtests.py
 include runsamples.py
 include setpath.sh