Entity framework 6 Support

[saadalia]

This framework is not supporting EF6
but I would like to share my working version of it
I was able to clone the code and upgrade it to EF6 and I tested it without any issue.

[JEkedorff]

@SaadAlyah: It sound great to me, would you mind creating a PR or share your changes here. Thanks in advance!
I get an error regarding Method GetServiceProviderHashCode which I suspect will be solved once FileContextCore can be supporting EF 6.0

[DaveRMaltby]

@SaadAlyah, thank you for mentioning this. I would also appreciate it if you would submit a PR or create a fork with the changes. Thank you!