Pinning missed tools and dependencies

Updating to Microsoft.NETCore.App 1.0.3

Branching for 1.1.0-preview1

Fix pinning of Microsoft.AspNetCore.Server.Testing (aspnet#841)

Tag for new release 1.0.0-rc2

Tag for new release 1.0.0-rc1

Tag for new release 1.0.0-beta8

Tag for new release 1.0.0-beta7

Tag for new release 1.0.0-beta6

Tag for new release 1.0.0-beta5