Uses newest version of engineyard-serverside 2.3.6

Disable automatic git garbage collection. To reenable, add `gc: true` to ey.yml.
Fix a bug where force pushed tags and other branch changes are never fixed in the repository cache.
Put the hostname in the filename for integrate logs so that they aren't overwritten by other integrate actions, thus becoming undebuggable.
More specific find command for permissions problems.
Fix file ownership on the integrate destination server before trying to rsync.
Fixes a problem where symlinks were not chown'd correctly, causing invalid permissions for rsync.