Xml Doc - Add some more xml doc

Some of it's just placeholder doc to keep sandcastle happy

Author: amaitland

CefSharp.Core/AbstractCefSettings.h

@@ -28,7 +28,7 @@ namespace CefSharp
         /// <summary>
         /// Default Constructor
         /// </summary>
-		AbstractCefSettings() : _cefSettings(new ::CefSettings())
+        AbstractCefSettings() : _cefSettings(new ::CefSettings())
         {
             _cefSettings->multi_threaded_message_loop = true;
             _cefSettings->no_sandbox = true;

CefSharp.OffScreen/CefSettings.cs

@@ -4,9 +4,15 @@
 
 namespace CefSharp.OffScreen
 {
+    /// <summary>
+    /// Initialization settings. Many of these and other settings can also configured
+    /// using command-line switches.
+    /// </summary>
     public class CefSettings : AbstractCefSettings
     {
-        //TODO: This is duplicated with the WPF version
+        /// <summary>
+        /// Intialize with default values
+        /// </summary>
         public CefSettings() : base()
         {
             WindowlessRenderingEnabled = true;

CefSharp.WinForms/CefSettings.cs

@@ -4,6 +4,10 @@
 
 namespace CefSharp.WinForms
 {
+    /// <summary>
+    /// Initialization settings. Many of these and other settings can also configured
+    /// using command-line switches.
+    /// </summary>
     public class CefSettings : AbstractCefSettings
     {
     }

CefSharp.Wpf/CefSettings.cs

@@ -4,9 +4,15 @@
 
 namespace CefSharp.Wpf
 {
+    /// <summary>
+    /// Initialization settings. Many of these and other settings can also configured
+    /// using command-line switches.
+    /// </summary>
     public class CefSettings : AbstractCefSettings
     {
-        //TODO: This is duplicated with the Offscreen version
+        /// <summary>
+        /// Intialize with default values
+        /// </summary>
         public CefSettings() : base()
         {
             WindowlessRenderingEnabled = true;

CefSharp/BindingOptions.cs

@@ -36,6 +36,9 @@ public static BindingOptions DefaultBinder
         /// </summary>
         public IMethodInterceptor MethodInterceptor { get; set; }
 
+        /// <summary>
+        /// Default constructor
+        /// </summary>
         public BindingOptions()
         {
             CamelCaseJavascriptNames = true;

CefSharp/Callback/IJavascriptCallback.cs

@@ -7,13 +7,21 @@
 
 namespace CefSharp
 {
+    /// <summary>
+    /// Javascript callback interface
+    /// </summary>
     public interface IJavascriptCallback : IDisposable
     {
         /// <summary>
         /// Callback Id
         /// </summary>
         Int64 Id { get; }
 
+        /// <summary>
+        /// Execute the javascript callback
+        /// </summary>
+        /// <param name="parms">param array of objects</param>
+        /// <returns>JavascriptResponse</returns>
         Task<JavascriptResponse> ExecuteAsync(params object[] parms);
 
         /// <summary>

CefSharp/Callback/IJsDialogCallback.cs

@@ -6,6 +6,9 @@
 
 namespace CefSharp
 {
+    /// <summary>
+    /// Callback interface used for asynchronous continuation of JavaScript dialog requests.
+    /// </summary>
     public interface IJsDialogCallback : IDisposable
     {
         /// <summary>

CefSharp/Callback/IRequestCallback.cs

@@ -6,6 +6,9 @@
 
 namespace CefSharp
 {
+    /// <summary>
+    /// Callback interface used for asynchronous continuation of url requests.
+    /// </summary>
     public interface IRequestCallback : IDisposable
     {
         /// <summary>

CefSharp/Callback/IResolveCallback.cs

@@ -7,6 +7,9 @@
 
 namespace CefSharp
 {
+    /// <summary>
+    /// Callback interface for <see cref="IRequestContext.ResolveHostAsync(Uri)"/>
+    /// </summary>
     public interface IResolveCallback : IDisposable
     {
         /// <summary>

CefSharp/Callback/IRunContextMenuCallback.cs

@@ -6,6 +6,9 @@
 
 namespace CefSharp
 {
+    /// <summary>
+    /// Callback interface used for continuation of custom context menu display.
+    /// </summary>
     public interface IRunContextMenuCallback : IDisposable
     {
         /// <summary>