$asc() and $desc() use deprecated constants

[JackoPlane]

As per this Mozilla bug, PREV, NEXT, PREVUNIQUE and NEXTUNIQUE are deprecated. This can cause issues in Google Chrome due to the way Chrome implements the IndexedDB specification:

Be careful in Chrome as it still implements the old specification along the new one. Similarly it still has the prefixed webkitIndexedDB property even if the unprefixed indexedDB is present.

[JackoPlane]

On deeper inspection, the root cause of $asc() and $desc() not apply any results is due to the change from ".order" and ".direction". Will submit pull request.

[bramski]

Will this be an issue in the new codebase @JackoPlane ? Please re-open this issue over there if that is the case.