Update NuGet-Config-File.markdown

added nuget extensibility point
Update Configuration-File-and-Source-Code-Transformations.markdown

Add XDT feature description
Update Configuration-File-and-Source-Code-Transformations.markdown

fix a typo
machine wide config
added the screenshot
machine wide config updated
Merge branch 'nuget-2.5-deepakv' of https://github.com/NuGet/NuGetDocs into nuget-2.5-deepakv
Merge branch 'master' into nuget-2.5-deepakv
removed c:\temp from the screenshot
Update NuGet-Config-File.markdown

Update the sku info
Update Configuration-File-and-Source-Code-Transformations.markdown

addressing comments by Luan
Merge pull request #104 from NuGet/nuget-2.5-danliu

Merge XDT transform from Nuget 2.5 danliu
Merge pull request #105 from NuGet/nuget-2.5-deepakv

Updated doc for NuGet.config extensibility
Update NuGet-Config-File.markdown
adding NuGet 2.6 release notes
removed acknowledgements, added section for the global package sources UX, added section for contextualizing search
Merge pull request #112 from howarddierking/nuget-next

adding NuGet 2.6 release notes
Update _metadata

Added NuGet 2.6 to make it come on the top on  docs.nuget.org
Update NuGet-2.6.markdown

Added NuGet split information
Update NuGet-2.6.markdown

updated the text