Add 5.5.39, 5.6.20

http://dev.mysql.com/doc/relnotes/mysql/5.5/en/news-5-5-39.html
http://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-20.html
Update mroonga to 4.05
Update q4m to 0.9.14
Add 5.5.40, 5.6.21, 5.7.5-m15

http://dev.mysql.com/doc/relnotes/mysql/5.5/en/news-5-5-40.html
http://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-21.html
http://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-5.html