SERVER-15965 add test for replset drain mode
SERVER-15695 fix and re-enable rollback_too_new.js + slight unittest enhancement
SERVER-15953: add wiredtiger to third_party
SERVER-15953: add wiredtiger storage engine integration
SERVER-15935 Check return value of setFollowerMode everywhere
Merge branch 'master' of https://github.com/mongodb/mongo into tokuft