Ease implementing remote entities

I'm currently doing some tests with exposing remote data/objects/entities as entities.

It actually works quite fine, thanks to EntityAPIController I can just override the query method. However, there is a hardcoded attempt to load the schema to deal with serialized fields in load()

I had to work around that by copy & pasting the load method and removing that stuff, would be nice if there would be a condition around it or another way to customize/override it without copying the whole thing.

I can provide a patch if you're ok with doing this.

PS: I do get some errors too from the default meta controller but I will have to override that anyway.