Add MD012, MD028 with tests, support multiple markers by line.

test/blockquote_blank_lines.md

@@ -0,0 +1,31 @@
+Some text
+
+> a quote
+> same quote
+
+> blank line above me
+
+
+> two blank lines above me
+ 
+> space above me
+
+* List with embedded blockquote
+
+  > Test
+  > Test
+
+  > Test
+
+* Item 2
+
+  > Test. The blank line below should _not_ trigger MD028 as one blockquote is
+  > inside the list, and the other is outside it.
+
+> Test
+
+Expected errors:
+
+{MD028:5} {MD028:8} {MD028:10} {MD028:17}
+{MD009:10} (trailing space is intentional)
+{MD012:8} (multiple blank lines are intentional)

test/consecutive_blank_lines.md

@@ -0,0 +1,11 @@
+Some text
+
+
+Some text {MD012:3}
+
+    This is a code block
+
+
+    with two blank lines in it
+
+Some more text

test/markdownlint-test.js

@@ -34,11 +34,12 @@ function createTestForFile(file) {
           var lines = contents.split(/\r\n|\r|\n/g);
           var results = {};
           lines.forEach(function forLine(line, lineNum) {
-            var match = line.match(/\{(MD\d+)(?::(\d+))?\}/);
-            if (match) {
+            var regex = /\{(MD\d+)(?::(\d+))?\}/g;
+            var match;
+            while ((match = regex.exec(line))) {
               var rule = match[1];
               var errors = results[rule] || [];
-              errors.push(lineNum + 1);
+              errors.push(match[2] ? parseInt(match[2], 10) : lineNum + 1);
               results[rule] = errors;
             }
           });