Prepare for v1.1 release.

Reviewed in https://codereview.appspot.com/7516045/.
diff --git a/apiclient/__init__.py b/apiclient/__init__.py
index 4802e90..f901408 100644
--- a/apiclient/__init__.py
+++ b/apiclient/__init__.py
@@ -1 +1 @@
-__version__ = "1.0"
+__version__ = "1.1"