Add a bunch of doc comments

We get a lot of build output because of missing XML comments that we
ignore. I'd like to stop ignoring them. To do that, we need to doc the
💩 out of everything.

Octokit/Models/Request/NewRepositoryHook.cs

@@ -2,29 +2,102 @@
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Globalization;
-using Octokit.Internal;
 
 namespace Octokit
 {
+    /// <summary>
+    /// Creates a Webhook for the repository.
+    /// </summary>
+    /// <remarks>
+    /// To create a webhook, the following fields are required by the config:
+    /// <list type="bullet">
+    /// <item>
+    ///   <term>url</term>
+    ///   <description>A required string defining the URL to which the payloads will be delivered.</description>
+    /// </item>
+    /// <item>
+    ///   <term>content_type</term>
+    ///   <description>
+    ///     An optional string defining the media type used to serialize the payloads.Supported values include json and
+    ///     form.The default is form.
+    ///   </description>
+    /// </item>
+    /// <item>
+    ///   <term>secret</term>
+    ///   <description>
+    ///     An optional string that’s passed with the HTTP requests as an X-Hub-Signature header. The value of this
+    ///     header is computed as the HMAC hex digest of the body, using the secret as the key.
+    ///   </description>
+    /// </item>
+    /// <item>
+    ///   <term>insecure_ssl:</term>
+    ///   <description>
+    ///     An optional string that determines whether the SSL certificate of the host for url will be verified when 
+    ///     delivering payloads.Supported values include "0" (verification is performed) and "1" (verification is not 
+    ///     performed). The default is "0".
+    ///   </description>
+    /// </item>
+    /// </list>
+    /// <para>
+    /// API: https://developer.github.com/v3/repos/hooks/#create-a-hook
+    /// </para>
+    /// </remarks>
     [DebuggerDisplay("{DebuggerDisplay,nq}")]
     public class NewRepositoryHook
     {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="NewRepositoryHook"/> class.
+        /// </summary>
+        /// <param name="name">
+        /// Use "web" for a webhook or use the name of a valid service. (See 
+        /// <see href="https://api.github.com/hooks">https://api.github.com/hooks</see> for the list of valid service
+        /// names.)
+        /// </param>
+        /// <param name="config">
+        /// Key/value pairs to provide settings for this hook. These settings vary between the services and are
+        /// defined in the github-services repository. Booleans are stored internally as “1” for true, and “0” for
+        /// false. Any JSON true/false values will be converted automatically.
+        /// </param>
         public NewRepositoryHook(string name, IReadOnlyDictionary<string, string> config)
         {
             Name = name;
             Config = config;
         }
 
-        [Parameter(Key = "name")]
-        public string Name { get; set; }
+        /// <summary>
+        /// Gets the name of the hook to create. Use "web" for a webhook or use the name of a valid service. (See 
+        /// <see href="https://api.github.com/hooks">https://api.github.com/hooks</see> for the list of valid service
+        /// names.)
+        /// </summary>
+        /// <value>
+        /// The name.
+        /// </value>
+        public string Name { get; private set; }
 
         /// <summary>
-        /// Is a key value structure determined by the web hook being created
+        /// Key/value pairs to provide settings for this hook. These settings vary between the services and are
+        /// defined in the github-services repository. Booleans are stored internally as “1” for true, and “0” for
+        /// false. Any JSON true/false values will be converted automatically.
         /// </summary>
+        /// <value>
+        /// The configuration.
+        /// </value>
         public IReadOnlyDictionary<string, string> Config { get; private set; }
 
+        /// <summary>
+        /// Determines what events the hook is triggered for. Default: ["push"]
+        /// </summary>
+        /// <value>
+        /// The events.
+        /// </value>
         public IEnumerable<string> Events { get; set; }
 
+        /// <summary>
+        /// Determines whether the hook is actually triggered on pushes.
+        /// </summary>
+        /// <value>
+        ///   <c>true</c> if active; otherwise, <c>false</c>.
+        /// </value>
         public bool Active { get; set; }
 
         internal string DebuggerDisplay