Fix the ItImpl parameters

Fixed the ItImpl parameters to make it work correctly with the Skipped
and Pending. I also set the ScriptBlock to empty scriptblock after
validating all parameters. That way the Invoke-Test function interface
is kept strict (it requires a ScriptBlock) while the desired
functionality is kept.  I am not sure if this is hundred percent
correct, because I am not sure where the boundary between Pester and
'Common Testing Framework' should be and what these should and should
not implement.

CHANGELOG.md

@@ -1,3 +1,7 @@
+## Unreleased
+  - Fix Skipped and Pending
+  - Fix output format on non-US systems
+
 ## 3.1 (October 23, 2014)
   - Fix mocking of Get-ItemProperty
   - Fix mocking commands with parameters named $FunctionName, $ModuleName or $ArgumentList under some circumstances. [GH-215]

Functions/It.Tests.ps1

@@ -74,7 +74,7 @@ InModuleScope Pester {
         $testState.LeaveTest()
 
         It 'Throws an error if you fail to pass in a test block' {
-            $scriptBlock = { ItImpl 'Some Name' }
+            $scriptBlock = { ItImpl -Pester $testState 'Some Name' }
             $scriptBlock | Should Throw 'No test script block is provided. (Have you put the open curly brace on the next line?)'
         }
 

Functions/It.ps1

@@ -110,21 +110,33 @@ about_should
 
 function ItImpl
 {
+    [CmdletBinding(DefaultParameterSetName = 'Normal')]
     param(
-        [Parameter(Mandatory = $true)]
+        [Parameter(Mandatory = $true, Position=0)]
         [string]$name,
-        [ScriptBlock] $test = $(Throw "No test script block is provided. (Have you put the open curly brace on the next line?)"),
+        [Parameter(Position = 1)]
+        [ScriptBlock] $test,
         [System.Collections.IDictionary[]] $TestCases,
+        [Parameter(ParameterSetName = 'Pending')]
+        [Switch] $Pending,
+
+        [Parameter(ParameterSetName = 'Skip')]
+        [Switch] $Skip,
+
         $Pester,
         [scriptblock] $OutputScriptBlock
     )
 
     Assert-DescribeInProgress -CommandName It
 
+    #unless Skip or Pending is specified you must specify a ScriptBlock to the Test parameter
     if (-not ($PSBoundParameters.ContainsKey('test') -or $Skip -or $Pending))
     {
         throw 'No test script block is provided. (Have you put the open curly brace on the next line?)'
     }
+
+    #the function is called with Pending or Skipped set the script block if needed
+    if ($null -eq $test) { $test = {} }
 
     #mark empty Its as Pending
     #[String]::IsNullOrWhitespace is not available in .NET version used with PowerShell 2