Updates build script

src/build.ps1

@@ -1,3 +1,19 @@
+<#
+
+.PARAMETER Script
+The build script to execute.
+.PARAMETER Target
+The build script target to run.
+
+#>
+
+[CmdletBinding()]
+Param(
+    [string]$Script = "build.cake",
+	[ValidateSet("Default", "UnitTest", "NuGetPack")]
+    [string]$Target
+)
+
 $ErrorActionPreference = 'Stop'
 
 Set-Location -LiteralPath $PSScriptRoot
@@ -9,5 +25,11 @@ $env:DOTNET_NOLOGO = '1'
 dotnet tool restore
 if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
 
-dotnet cake @args
+# Build Cake arguments
+$cakeArguments = @("$Script");
+if ($Target) { $cakeArguments += "--target=$Target" }
+
+# Start Cake
+Write-Host "Running build script..."
+dotnet cake $cakeArguments
 if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }