Implemented methods for creating an authorization without having to specify an app clientid/clientsecret.

These methods will ONLY work with username/password Basic Auth.

Added a helper method to return a GitHub client using basic auth credentials as if you have both password and oauth token environment variables, you get credentials based on the oauth token.

Octokit/Clients/IAuthorizationsClient.cs

@@ -47,6 +47,43 @@ namespace Octokit
             Justification = "It's fiiiine. It's fine. Trust us.")]
         Task<Authorization> Get(int id);
 
+        /// <summary>
+        /// Creates a new personal token for the authenticated user.
+        /// </summary>
+        /// <remarks>
+        /// This method requires authentication.
+        /// See the <a href="https://developer.github.com/v3/oauth_authorizations/#create-a-new-authorization">API documentation</a> for more information.
+        /// </remarks>
+        /// <param name="newAuthorization">Describes the new authorization to create</param>
+        /// <exception cref="AuthorizationException">
+        /// Thrown when the current user does not have permission to make this request.
+        /// </exception>
+        /// <exception cref="TwoFactorRequiredException">
+        /// Thrown when the current account has two-factor authentication enabled and an authentication code is required.
+        /// </exception>
+        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
+        /// <returns>The created <see cref="Authorization"/>.</returns>
+        Task<ApplicationAuthorization> Create(NewAuthorization newAuthorization);
+
+        /// <summary>
+        /// Creates a new personal token for the authenticated user.
+        /// </summary>
+        /// <remarks>
+        /// This method requires authentication.
+        /// See the <a href="https://developer.github.com/v3/oauth_authorizations/#create-a-new-authorization">API documentation</a> for more information.
+        /// </remarks>
+        /// <param name="twoFactorAuthenticationCode">The two-factor authentication code in response to the current user's previous challenge</param>
+        /// <param name="newAuthorization">Describes the new authorization to create</param>
+        /// <exception cref="AuthorizationException">
+        /// Thrown when the current user does not have permission to make this request.
+        /// </exception>
+        /// <exception cref="TwoFactorRequiredException">
+        /// Thrown when the current account has two-factor authentication enabled and an authentication code is required.
+        /// </exception>
+        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
+        /// <returns>The created <see cref="Authorization"/>.</returns>
+        Task<ApplicationAuthorization> Create(NewAuthorization newAuthorization, string twoFactorAuthenticationCode);
+
         /// <summary>
         /// Creates a new authorization for the specified OAuth application if an authorization for that application
         /// doesn’t already exist for the user; otherwise, it fails.