Implement PropertyLoadSaver

[kylefinley]

For compatablity with appengine/datastore. gaego/ds should implement PropertyLoadSaver

[mjohnson9]

@kylefinley,
Any news on this? :)

P.S.: Sorry that I've been gone so long.

[kylefinley]

@nightexcessive,

Unfortunately I haven't had time to look into this yet. cachestore supports PropertyLoadSaver so it should be possible, It will probably be a few more weeks before I can dedicate some time to though.

reference:

• cachestore
• cachestore discussion