Merge pull request #163 from NuGet/danliu/gallerystatusreport

Danliu/gallerystatusreport
add package statistics verify
Merge pull request #164 from NuGet/packagestat

add package statistics verify
fix package stat
small fix
code cleanup
Merge pull request #165 from NuGet/packagestatfix

fix package stat
add weekly report task - first draft
Merge branch 'master' of https://github.com/NuGet/NuGet.Services.Dashboard into danliu/gallerystatusreport