Add front_matter_title parameter to MD025/single-title/single-h1 (refs #169).

test/detailed-results-MD022-MD030.results.json

@@ -28,7 +28,7 @@
     },
     {
         "lineNumber": 4,
-        "ruleNames": [ "MD025", "single-h1" ],
+        "ruleNames": [ "MD025", "single-title", "single-h1" ],
         "ruleDescription": "Multiple top level headings in the same document",
         "ruleInformation": "https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/Rules.md#md025",
         "errorDetail": null,

test/front-matter-alt-title-h1.json

@@ -0,0 +1,7 @@
+{
+  "default": true,
+  "MD013": false,
+  "MD025": {
+    "front_matter_title": "^\\s*alternate="
+  }
+}

test/front-matter-alt-title-h1.md

@@ -0,0 +1,6 @@
+---
+alternate="Welcome to Jekyll!"
+---
+# Top level heading {MD025}
+
+Front matter from [Jekyll documentation](https://jekyllrb.com/docs/posts/#a-typical-post).

test/front-matter-title-h1.md

@@ -4,6 +4,6 @@ title:  "Welcome to Jekyll!"
 date:   2015-11-17 16:16:01 -0600
 categories: jekyll update
 ---
-# Top level heading
+# Top level heading {MD025}
 
 Front matter from [Jekyll documentation](https://jekyllrb.com/docs/posts/#a-typical-post).

test/hugo-quickstart-example-blank.json

@@ -1,4 +1,7 @@
 {
   "default": true,
+  "MD025": {
+    "front_matter_title": ""
+  },
   "MD041": true
 }

test/hugo-quickstart-example-clean.json

@@ -1,4 +1,7 @@
 {
   "default": true,
+  "MD025": {
+    "front_matter_title": ""
+  },
   "MD041": true
 }

test/jekyll_post.md

@@ -9,7 +9,7 @@ tags:
 url: https://example.com
 excerpt: Hello World! Vestibulum imperdiet adipiscing arcu, quis aliquam dolor condimentum dapibus. Aliquam fermentum leo aliquet quam volutpat et molestie mauris mattis. Suspendisse semper consequat velit in suscipit.
 ---
-# heading1
+# heading1 {MD025}
 
 This is just a sample post.