re-pin to pester fixes, added pester hello world test

scripts/pester/Get-HelloWorld.Tests.ps1

@@ -0,0 +1,13 @@
+"starting test script" | out-host
+
+$here = Split-Path -Parent $MyInvocation.MyCommand.Path
+$here | out-host
+$sut = (Split-Path -Leaf $MyInvocation.MyCommand.Path).Replace(".Tests.", ".")
+$sut | out-host
+. "$here\$sut"
+ 
+Describe "Get-HelloWorld" {
+    It "outputs 'Hello world!'" {
+        Get-HelloWorld | Should Be 'Hello world!'
+    }
+}

scripts/pester/Get-HelloWorld.ps1

@@ -0,0 +1,3 @@
+function Get-HelloWorld {
+   'Hello world!'
+}