Add common build files.
Updated build files.
Updating build.cmd to cache NuGet.exe
Initial configuration mockup.
Full Ini file parsing.
Add extension methods.  Rename Manual to InMemory.
Workaround for myget being down
Updating ConfigurationModel prototype code
PR comments and class names

later configuration sources should be able to control what
values are returned, to enable "remove"ing subkey spaces
Making IConfiguration NotAssemblyNeutral until tooling sorted out
Constants should be readonly, and removing leftover lines
Fixing bugs in sub key navigation
Added the required packages for K
Updating Configuration based on usage

* IConfiguration.TryGet is useful for consumers
* IExtendableConfiguration var should still be an IConfiguration
* MemoryConfigurationSource is nice to initialize with dictionary syntax
* Configuration can recognize collection initialization syntax
Renaming IExtendableConfiguration to IConfigurationSourceContainer
Add command line extension with args.
Updating CoreCLR package versions
Removed ifdef since we have Environment.GetCommandLineVariables on k10
Rename solution to match the repository name
Add JSON config file format as a separate project