jubatus/jubatus — pull request #793 by kmaehashi (2014-05-22 06:45:58+00:00)
Title: Fix build without --enable-zookeeper to work

Issue #754 introduced pure virtual `std::string type() const` in mixable class, however dummy_mixer did not implement it.

This caused CI configure variation test (pattern without --enable-zookeeper) to fail: http://ci.jubat.us/job/develop_configure/904/testReport/%28root%29/configure/