Upgrade and fix clang-format-vs

[Antonio Maiorano via cfe-commits]

Hello,

This patch for clang-format-vs includes the following:

- Upgrade to VS 2015, including .NET framework upgrade from 4.0 to 4.5, and
upgrading Microsoft.VisualStudio references to v14 versions
- Fix build by removing dependency on "Key.snk" file which was never
checked in (and not really required anyway)
- Add ".vs" directory to svn ignore (new folder that VS 2015 creates for
user settings)

Antonio Maiorano
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