Update INSTALL

Ant 1.8.0 throws an error, but 1.9.3 works fine. I listed 1.9.0 as most likely the right version.
Update build-check-versions.xml

update required ant version to 1.9.0
Merge remote-tracking branch 'origin/patch-1'
Merge pull request #2 from struktured/master

Fix required Ant version.