Added missing solution files

Author: asbjornu

src/GitVersion.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 14
-VisualStudioVersion = 14.0.24720.0
+VisualStudioVersion = 14.0.25123.0
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "GitVersionExe", "GitVersionExe\GitVersionExe.csproj", "{C3578A7B-09A6-4444-9383-0DEAFA4958BD}"
 EndProject
@@ -13,6 +13,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "GitVersionCore.Tests", "Git
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{3EFFC5D6-88D0-49D9-BB53-E1B7EB49DD45}"
 	ProjectSection(SolutionItems) = preProject
+		..\.gitattributes = ..\.gitattributes
+		..\.gitignore = ..\.gitignore
 		..\.travis.yml = ..\.travis.yml
 		..\appveyor.yml = ..\appveyor.yml
 		..\BREAKING CHANGES.md = ..\BREAKING CHANGES.md