NuGetV2Feed Mirrorer Job. Included work job style parameters
with defaults and validation

1) TODO: Uncomment install and push code to test them
2) TODO: Change Console.WriteLine to ETW events :(
Validated that

0) Polling of source v2Feed works
1) Package Mirroring works
2) Validated that the get and set of the Mirror.json works
Converted Console.WriteLines to ETW events
Incorporated comments on the pull request
Merge pull request #34 from NuGet/daravind/NuGetV2RepositoryMirrorerJob

NuGet V2 Repository Mirrorer Job