Add maximum parameter to MD012/no-multiple-blanks (fixes #27).

test/markdownlint-test.js

@@ -857,7 +857,7 @@ module.exports.readme = function readme(test) {
 };
 
 module.exports.doc = function doc(test) {
-  test.expect(294);
+  test.expect(295);
   fs.readFile("doc/Rules.md", shared.utf8Encoding,
     function readFile(err, contents) {
       test.ifError(err);

test/no-multiple-blanks-maximum.json

@@ -0,0 +1,6 @@
+{
+  "default": true,
+  "MD012": {
+    "maximum": 3
+  }
+}

test/no-multiple-blanks-maximum.md

@@ -0,0 +1,46 @@
+# Heading
+
+Text
+
+Text
+
+
+Text
+
+
+
+Text
+
+
+
+
+Text {MD012:16}
+
+
+
+
+
+Text {MD012:21} {MD012:22}
+
+
+
+
+
+
+Text {MD012:27} {MD012:28} {MD012:29}
+
+Text
+
+
+
+
+Text {MD012:36}
+
+
+
+Text
+
+
+Text
+
+Text

test/no-multiple-blanks.md

@@ -0,0 +1,24 @@
+# Heading
+
+Text
+
+Text
+
+
+Text {MD012:7}
+
+
+
+Text {MD012:10} {MD012:11}
+
+
+
+
+Text {MD012:14} {MD012:15} {MD012:16}
+
+Text
+
+
+Text {MD012:21}
+
+Text