Update jquery.postcodify to 1.8 and re-enable auto-updater [author]

Sorry for crashing your updater last time.
The upstream repo now has version tags,
so please try re-enabling the auto-updater on this library.
Fix stray comma in update.json
Merge pull request #1127 from kijin/master

Update jquery.postcodify to 1.8 and re-enable auto-updater [author]