Added Travis build file

Author: asbjornu

.travis.yml

@@ -0,0 +1,10 @@
+language: csharp
+solution: src/GitVersion.sln
+sudo: false
+install:
+  - mkdir -p src/.nuget
+  - wget -NO src/.nuget/nuget.exe https://dist.nuget.org/win-x86-commandline/latest/nuget.exe
+script:
+	- mono --runtime=v4.0.30319 "src/.nuget/nuget.exe" Restore "./src/GitVersion.sln"
+	- xbuild "./src/GitVersion.sln" 
+	- mono --debug --runtime=v4.0.30319 ./src/packages/NUnit.Runners.2.6.4/tools/nunit-console.exe ./src/GitVersionTask.Tests/bin/Debug/GitVersionTask.Tests.dll ./src/GitVersionCore.Tests/bin/Debug/GitVersionCore.Tests.dll ./src/GitVersionTask.Tests/bin/Debug/GitVersionTask.Tests.dll ./src/GitVersionExe.Tests/bin/Debug/GitVersionExe.Tests.dll -nodots

src/GitVersion.sln

@@ -13,6 +13,7 @@ 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
+		..\.travis.yml = ..\.travis.yml
 		..\appveyor.yml = ..\appveyor.yml
 		..\BREAKING CHANGES.md = ..\BREAKING CHANGES.md
 		..\Build.cmd = ..\Build.cmd