Rename Microsoft.Framework.* to Microsoft.Extensions.*

[Eilon]

Need to rename assemblies and namespaces from Microsoft.Framework.* to Microsoft.Extensions.*.

Once the change is committed, please post an issue in the https://github.com/aspnet/Announcements/issues/ repo that links back to this issue.

[Eilon]

@HaoK unless you really want to do this, @pranavkm is going to bulk do them all.

[HaoK]

Yay I really don't... :)

[divega]

😄

[pranavkm]

3fc0489