Added build scripts

Author: DavidChristiansen

.nuget/NuGet.exe

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+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="psake" version="4.4.1" />
+</packages>

.nuget/packages.config

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+Param(
+    [string]$buildNumber = "0",
+    [string]$preRelease = $null
+)
+
+gci .\ -Recurse "packages.config" |% {
+    "Restoring " + $_.FullName
+    .\.nuget\nuget.exe i $_.FullName -o .\packages
+}
+
+Import-Module .\packages\psake.4.4.1\tools\psake.psm1
+
+if(Test-Path Env:\APPVEYOR_BUILD_NUMBER){
+    $buildNumber = [int]$Env:APPVEYOR_BUILD_NUMBER
+    Write-Host "Using APPVEYOR_BUILD_NUMBER"
+
+    $task = "appVeyor"
+}
+
+"Build number $buildNumber"
+
+Invoke-Psake .\default.ps1 $task -framework "4.0x64" -properties @{ buildNumber=$buildNumber; preRelease=$preRelease }
+
+Remove-Module psake

build.ps1

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+properties {
+	$base_directory = Resolve-Path . 
+	$src_directory = "$base_directory"
+	$output_directory = "$base_directory\build"
+	$sln_file = "$src_directory\DotNetOpenAuth.Samples.sln"
+	$target_config = "Release"
+	$framework_version = "v4.5"
+	$nuget_path = "$src_directory\.nuget\nuget.exe"
+	
+	$buildNumber = 0;
+	$version = "2.5.0.0"
+	$preRelease = $null
+}
+
+task default -depends Clean, Compile
+task appVeyor -depends Clean, Compile
+
+task Clean {
+	rmdir $output_directory -ea SilentlyContinue -recurse
+	exec { msbuild /nologo /verbosity:quiet $sln_file /p:Configuration=$target_config /t:Clean }
+}
+
+task Compile -depends UpdateVersion {
+	exec { msbuild /nologo /verbosity:q $sln_file /p:Configuration=$target_config /p:TargetFrameworkVersion=v4.5 }
+}
+
+task UpdateVersion {
+	$vSplit = $version.Split('.')
+	if($vSplit.Length -ne 4)
+	{
+		throw "Version number is invalid. Must be in the form of 0.0.0.0"
+	}
+	$major = $vSplit[0]
+	$minor = $vSplit[1]
+	$patch = $vSplit[2]
+	$assemblyFileVersion =  "$major.$minor.$patch.$buildNumber"
+	$assemblyVersion = "$major.$minor.0.0"
+	$versionAssemblyInfoFile = "$src_directory/VersionAssemblyInfo.cs"
+	"using System.Reflection;" > $versionAssemblyInfoFile
+	"" >> $versionAssemblyInfoFile
+	"[assembly: AssemblyVersion(""$assemblyVersion"")]" >> $versionAssemblyInfoFile
+	"[assembly: AssemblyFileVersion(""$assemblyFileVersion"")]" >> $versionAssemblyInfoFile
+}

default.ps1

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <add key="Nuget" value="https://www.nuget.org/api/v2/" />
+  </packageSources>
+  <activePackageSource>
+    <add key="All" value="(Aggregate source)" />
+  </activePackageSource>
+</configuration>