build: sync node versions to those used in travis (0.10, 0.12, 4.x, 6.x, 7.x)
build: sync node versions to those used in travis (0.10, 0.12, 4.x, 6.x, 7.x)

sidorares/node-mysql2,sidorares/node-mysql2,sidorares/node-mysql2,sidorares/node-mysql2