Release 1.9.3-p550, 2.0.0-p594, 2.1.4 for security fixes.
update download items
Merge pull request #866 from ruby/release_2.1.4_2.0.0_1.9.3

Release 1.9.3-p550, 2.0.0-p594, 2.1.4 for security fixes.