Added a temporary key to builds to allow anonymous builds to save stats on resync. It is set during sync, the AJAX request uses it on the success page and then it's unset as soon as the stats are updated.

Also changed the behavior on Sync's, preventing users from hitting "Refresh" on the sync results page causing a secondary sync.
Merge pull request #18 from aaroncox/master

Last Pull Request for a bit, going to commit directly until others join in.