Fixed problem with missing __init__.py files.
diff --git a/MANIFEST.in b/MANIFEST.in
index 74ab314..138cc64 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,5 +1,5 @@
 recursive-include tests *.py *.json
-recursive-include apiclient *.json
+recursive-include apiclient *.json *.py
 recursive-include docs *.html
 recursive-include samples *.py *.png *.html *.yaml *.json
 include runtests.py