Bump SDK version to 1.3.8
Bump SDK version to 1.3.8

git-svn-id: 120402244b5714bfc5c7f1741d57d585f71ae04f@119 441dd3cb-e453-d85f-364a-b28e0c74875c

mikea/appengine-mapreduce,johnwlockwood/appengine-mapreduce,johnwlockwood/appengine-mapreduce,OsoTech/appengine-mapreduce,OsoTech/appengine-mapreduce,mikea/appengine-mapreduce,OsoTech/appengine-mapreduce,mikea/appengine-mapreduce,mikea/appengine-mapreduce,OsoTech/appengine-mapreduce,johnwlockwood/appengine-mapreduce,johnwlockwood/appengine-mapreduce