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Restore this common project.json upfront to improve sync time and avoid download contention from nuget.


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Our common tests folder has gotten a bit unwieldy in its organization.  This change simply moves files around to better map to how src\Common\src is organized.  Files are now stored in a path based on functionality/namespace.

I mostly kept groups of functionality together and did not attempt to reorganize at that level, e.g. I moved the src\Common\tests\System.Xml.XPath\ folder to be src\Common\tests\System\Xml\XPath\ and did not further reorganize all of the folders/files it contains.  Such cleanup can be done separately on each individual area.

Some of the files also need to be cleaned up internally, e.g. the namespace (or lack thereof), so I put such things in a path that I thought made sense even if it differs from the current namespace in the file; I wanted this change to be relatively simple and just be about moving files around to clean up the main hierarchy.


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Since the move to project.json we no longer use packages.config


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DNX and BuildTools now support all of the nuget v2 conventions that we depend on so we can
move all remaining nuget v2 packages to the project.json file and eliminate packages.config.

This change also adds "frameworks" to the project.json so that dnu restore can calculate
applicable assets.  I am not yet using "runtimes" in the project.json since we are still resolving
our runtime assets manually (eg: build tools copies known files from packages).  A future
change will move us to using our runtime packages and add runtimes sections to projects
as appropriate.


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This change updates all projects to the latest CoreFx packages which make use of nuget v3 features and thus require project.json.  Packages.config remains for the packages which are not yet compatible with the new build task (mainly because we need to resolve to PCL folders).
The entire change was done by a tool in order to not miss any dependencies, and ensure we have project items for the packages.config/project.json.  One side effect of using the tool is some reformatting of whitespace in the projects.


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Fixes dotnet/corefx#744


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