Make /client/bin/input a package

BUG=chromium-os:12425
TEST=none

Change-Id: Id2865d8074977ac230629845147324f619674479
Reviewed-on: http://gerrit.chromium.org/gerrit/3631
Reviewed-by: Joseph Shyh-In Hwang <josephsih@chromium.org>
Tested-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
diff --git a/client/bin/input/__init__.py b/client/bin/input/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/client/bin/input/__init__.py