Put Get-ExcelColumnName Back in

Violated the "break nothing" rule by taking it out

Get-ExcelColumnName.ps1

@@ -0,0 +1,22 @@
+function Get-ExcelColumnName {
+    param(
+        [Parameter(ValueFromPipeline=$true)]
+        $columnNumber=1
+    )
+
+    Process {
+        $dividend = $columnNumber
+        $columnName = @()
+        while($dividend -gt 0) {
+            $modulo      = ($dividend - 1) % 26
+            $columnName += [char](65 + $modulo)
+            $dividend    = [int](($dividend -$modulo)/26)
+        }
+
+        [PSCustomObject] @{
+            ColumnNumber = $columnNumber
+            ColumnName   = $columnName -join ''
+        }
+
+    }
+}