Add new command closes #131

BluebirdPS/public/api_v2/lists/Remove-TwitterListMembership.ps1

@@ -0,0 +1,32 @@
+function Remove-TwitterListMembership {
+    [CmdletBinding()]
+    param(
+        [Parameter(Mandatory)]
+        [ValidateObjectNotNullOrEmpty()]
+        [BluebirdPS.APIV2.ListInfo.List]$List
+    )
+
+    $User = Get-TwitterUser
+    $MemberOfLists = Get-TwitterListMembership
+    if (Test-TwitterListMembership -List $List -User $User) {
+        $ListOwner = Get-TwitterUser -User $List.OwnerId
+        if ($ListOwner.Id -eq $User.Id) {
+            'You cannot use this command to remove yourself from a list you own. Instead, use Remove-TwitterListMember.' | Write-Warning
+            return
+        }
+        if ($List.OwnerId -in $MemberOfLists.OwnerId) {
+            foreach ($MemberOf in $MemberOfLists) {
+                if ($List.Id -ne $MemberOf.Id) {
+                    'You are also a member of {0} owned by {1}' -f $MemberOf.ToShortString(),$ListOwner.ToString() | Write-Warning
+                }
+            }
+        }
+        $ListOwner | Set-TwitterBlockedUser -Block | Out-Null
+        $ListOwner | Set-TwitterBlockedUser -Unblock | Out-Null
+
+        if (-Not (Test-TwitterListMembership -List $List -User $User)) {
+            'Successfully removed from {0}' -f $List.ToShortString()
+        }
+    }
+
+}