Add EntityFramework Provider

[Turnerj]

Look into adding an EntityFramework caching provider. Possible options:

• On one hand, it would be a specific table and structure as determined by the provider with some sort of serialization.
• On the other hand, have some way where the setting is propagated to some other handler which then directly controls how the fetch and retrieve is done.

Note: If the latter makes more sense, maybe then it makes more senses as a "generic" thing?

Lots of things to think about...