Download page should not link to snapshots / nightly builds

Snapshot builds are not officially sanctioned, and should not be promoted to the general public, so should not appear on the normal download page(s).

Please remove the snapshot reference from the main download page.

See:

http://www.apache.org/dev/release.html#what

"Do not include any links on the project website that might encourage non-developers to download and use nightly builds, snapshots, release candidates, or any other similar package."