Adding support for EF6-Alpha3

Adding support for Entity Framework 6 (currently at Alpha 3).
It is now much easier to add profiling support to the entity framework
simply by the appropriate providers either through configuration or in
code.
Updating to EF6-Beta1

Updating the references to target Entity Framework 6 - Beta 1.
Merge pull request #142 from stebet/master

Adding support for Entity Framework 6 (Currently at Beta 1).