Add the VersionDownloadCount property back for NuGet.Server to support NuGetPackageExplorer.
Add the VersionDownloadCount property back for NuGet.Server to support NuGetPackageExplorer.

--HG--
branch : 1.8

atheken/nuget,RichiCoder1/nuget-chocolatey,pratikkagda/nuget,jholovacs/NuGet,GearedToWar/NuGet2,jmezach/NuGet2,antiufo/NuGet2,xoofx/NuGet,RichiCoder1/nuget-chocolatey,RichiCoder1/nuget-chocolatey,dolkensp/node.net,indsoft/NuGet2,pratikkagda/nuget,GearedToWar/NuGet2,zskullz/nuget,mrward/NuGet.V2,xoofx/NuGet,kumavis/NuGet,pratikkagda/nuget,GearedToWar/NuGet2,anurse/NuGet,indsoft/NuGet2,mono/nuget,dolkensp/node.net,oliver-feng/nuget,mrward/nuget,rikoe/nuget,oliver-feng/nuget,antiufo/NuGet2,jholovacs/NuGet,GearedToWar/NuGet2,chocolatey/nuget-chocolatey,mrward/nuget,chester89/nugetApi,jholovacs/NuGet,oliver-feng/nuget,atheken/nuget,jmezach/NuGet2,jmezach/NuGet2,jmezach/NuGet2,themotleyfool/NuGet,jholovacs/NuGet,mrward/nuget,ctaggart/nuget,antiufo/NuGet2,mrward/nuget,mrward/nuget,alluran/node.net,rikoe/nuget,anurse/NuGet,ctaggart/nuget,oliver-feng/nuget,chocolatey/nuget-chocolatey,indsoft/NuGet2,mrward/nuget,xoofx/NuGet,zskullz/nuget,GearedToWar/NuGet2,indsoft/NuGet2,oliver-feng/nuget,alluran/node.net,jholovacs/NuGet,xero-github/Nuget,rikoe/nuget,chocolatey/nuget-chocolatey,mono/nuget,akrisiun/NuGet,themotleyfool/NuGet,akrisiun/NuGet,antiufo/NuGet2,xoofx/NuGet,zskullz/nuget,mrward/NuGet.V2,OneGet/nuget,pratikkagda/nuget,dolkensp/node.net,zskullz/nuget,themotleyfool/NuGet,jmezach/NuGet2,OneGet/nuget,indsoft/NuGet2,antiufo/NuGet2,OneGet/nuget,xoofx/NuGet,jholovacs/NuGet,OneGet/nuget,mrward/NuGet.V2,antiufo/NuGet2,mono/nuget,jmezach/NuGet2,chocolatey/nuget-chocolatey,alluran/node.net,GearedToWar/NuGet2,mrward/NuGet.V2,mrward/NuGet.V2,kumavis/NuGet,oliver-feng/nuget,pratikkagda/nuget,alluran/node.net,chocolatey/nuget-chocolatey,chester89/nugetApi,RichiCoder1/nuget-chocolatey,pratikkagda/nuget,chocolatey/nuget-chocolatey,dolkensp/node.net,mrward/NuGet.V2,rikoe/nuget,indsoft/NuGet2,ctaggart/nuget,RichiCoder1/nuget-chocolatey,mono/nuget,ctaggart/nuget,xoofx/NuGet,RichiCoder1/nuget-chocolatey