Added branches in default config to GitVersion init branch list

GitVersion init branch configuration only includes branches which have custom config, this made it not very useful. Now at least you don't have to look at the source to se the branch regexes. We probably should take the next step of creating an alias so they key doesn't have to be a regex

Author: JakeGinnivan

src/GitVersionCore/Configuration/Init/SetConfig/ConfigureBranches.cs

@@ -3,7 +3,7 @@ namespace GitVersion.Configuration.Init.SetConfig
     using System;
     using System.Collections.Generic;
     using System.Linq;
-    using GitVersion.Configuration.Init.Wizard;
+    using Wizard;
     using GitVersion.Helpers;
 
     public class ConfigureBranches : ConfigInitWizardStep
@@ -26,7 +26,13 @@ protected override StepResult HandleResult(string result, Queue<ConfigInitWizard
                 try
                 {
                     var foundBranch = OrderedBranches(config).ElementAt(parsed - 1);
-                    steps.Enqueue(new ConfigureBranch(foundBranch.Key, foundBranch.Value, Console, FileSystem));
+                    var branchConfig = foundBranch.Value;
+                    if (branchConfig == null)
+                    {
+                        branchConfig = new BranchConfig();
+                        config.Branches.Add(foundBranch.Key, branchConfig);
+                    }
+                    steps.Enqueue(new ConfigureBranch(foundBranch.Key, branchConfig, Console, FileSystem));
                     return StepResult.Ok();
                 }
                 catch (ArgumentOutOfRangeException)
@@ -46,7 +52,13 @@ protected override string GetPrompt(Config config, string workingDirectory)
 
         static IOrderedEnumerable<KeyValuePair<string, BranchConfig>> OrderedBranches(Config config)
         {
-            return config.Branches.OrderBy(b => b.Key);
+            var defaultConfig = new Config();
+            ConfigurationProvider.ApplyDefaultsTo(defaultConfig);
+            var defaultConfigurationBranches = defaultConfig.Branches
+                .Where(k => !config.Branches.ContainsKey(k.Key))
+                // Return an empty branch config
+                .Select(v => new KeyValuePair<string, BranchConfig>(v.Key, null));
+            return config.Branches.Union(defaultConfigurationBranches).OrderBy(b => b.Key);
         }
 
         protected override string DefaultResult