Send final modifications before removing an object from a bucket

[beaucollins]

An object should send all pending modifications before it is removed from the bucket.

[beaucollins]

After some testing this appears to be the issue:

1. Bucket object is modified and saved but not yet sent BucketObject.save()
2. Bucket object is removed from bucket BucketObject.remove()
3. Change processor kicks in to send the modification change
4. Change processor tries to query for object to produce the diff but it no longer exists in the local persistent store due to step 2
5. Modification attempt throws ChangeNotSentException
6. Remove operation is sent

To resolve this we probably need to copy the data to diff during the modification operation so the storage system doesn't need to be queried. This will also solve #158.

[roundhill]

There's a fair amount of crashes in the WordPress client for #158. Think you could knock this one out soon?

[roundhill]

fair amount of crashes

And by fair, i mean 14 so far in 3.3 so not terrible.