- Fixes #8
- Fixes #9
- Fixes #10
- Fixes #11
- Fixes #12
- Differentiated between a missing ID which is the subject of an action (e.g. the subscription when moving a subscription) and other missing IDs (e.g. the folder when moving a subscription)
- Enforced same rules for subscription titles as for folder names, save that null is valid for subscriptions
- URLs are now matched centrally against a whitelist
- %-encoded URLs are still handled correctly
- Dispatched methods now only handle one specific task
- Filler methods (e.g. versionPOST) are no longer required
- Unhandled URLs now return 501 Not Implemented rather than 404 Not Found; this removes some ambiguity in the semantics of 404
