Add style "zero" to MD029/ol-prefix (fixes #140).

test/detailed-results-ordered-list-item-prefix-single.md

@@ -0,0 +1,3 @@
+# Ordered list examples
+
+9. Item

test/detailed-results-ordered-list-item-prefix-single.results.json

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+[
+    {
+        "lineNumber": 3,
+        "ruleNames": [ "MD029", "ol-prefix" ],
+        "ruleDescription": "Ordered list item prefix",
+        "ruleInformation": "https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/Rules.md#md029",
+        "errorDetail": "Expected: 1; Actual: 9; Style: 1/1/1",
+        "errorContext": null,
+        "errorRange": [1, 3]
+    }
+]

test/detailed-results-ordered-list-item-prefix-zero.json

@@ -0,0 +1,6 @@
+{
+  "default": true,
+  "MD029": {
+    "style": "zero"
+  }
+}

test/detailed-results-ordered-list-item-prefix-zero.md

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+# Ordered list examples
+
+text
+
+0. Item
+0. Item
+0. Item
+
+text
+
+1. Item
+1. Item
+1. Item
+
+text
+
+1. Item
+2. Item
+3. Item

test/detailed-results-ordered-list-item-prefix-zero.results.json

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+[
+    {
+        "lineNumber": 11,
+        "ruleNames": [ "MD029", "ol-prefix" ],
+        "ruleDescription": "Ordered list item prefix",
+        "ruleInformation": "https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/Rules.md#md029",
+        "errorDetail": "Expected: 0; Actual: 1; Style: 0/0/0",
+        "errorContext": null,
+        "errorRange": [1, 3]
+    },
+    {
+        "lineNumber": 12,
+        "ruleNames": [ "MD029", "ol-prefix" ],
+        "ruleDescription": "Ordered list item prefix",
+        "ruleInformation": "https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/Rules.md#md029",
+        "errorDetail": "Expected: 0; Actual: 1; Style: 0/0/0",
+        "errorContext": null,
+        "errorRange": [1, 3]
+    },
+    {
+        "lineNumber": 13,
+        "ruleNames": [ "MD029", "ol-prefix" ],
+        "ruleDescription": "Ordered list item prefix",
+        "ruleInformation": "https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/Rules.md#md029",
+        "errorDetail": "Expected: 0; Actual: 1; Style: 0/0/0",
+        "errorContext": null,
+        "errorRange": [1, 3]
+    },
+    {
+        "lineNumber": 17,
+        "ruleNames": [ "MD029", "ol-prefix" ],
+        "ruleDescription": "Ordered list item prefix",
+        "ruleInformation": "https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/Rules.md#md029",
+        "errorDetail": "Expected: 0; Actual: 1; Style: 0/0/0",
+        "errorContext": null,
+        "errorRange": [1, 3]
+    },
+    {
+        "lineNumber": 18,
+        "ruleNames": [ "MD029", "ol-prefix" ],
+        "ruleDescription": "Ordered list item prefix",
+        "ruleInformation": "https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/Rules.md#md029",
+        "errorDetail": "Expected: 0; Actual: 2; Style: 0/0/0",
+        "errorContext": null,
+        "errorRange": [1, 3]
+    },
+    {
+        "lineNumber": 19,
+        "ruleNames": [ "MD029", "ol-prefix" ],
+        "ruleDescription": "Ordered list item prefix",
+        "ruleInformation": "https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/Rules.md#md029",
+        "errorDetail": "Expected: 0; Actual: 3; Style: 0/0/0",
+        "errorContext": null,
+        "errorRange": [1, 3]
+    }
+]

test/ordered-list-item-prefix-zero.json

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+{
+  "default": true,
+  "MD029": {
+    "style": "zero"
+  }
+}

test/ordered-list-item-prefix-zero.md

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+# Ordered list examples
+
+text
+
+0. Item
+
+text
+
+1. Item {MD029}
+
+text
+
+0. Item
+0. Item
+0. Item
+
+text
+
+1. Item {MD029}
+2. Item {MD029}
+3. Item {MD029}
+
+text
+
+0. Item
+1. Item {MD029}
+0. Item
+2. Item {MD029}
+
+text
+
+0. Item
+0. Item
+2. Item {MD029}
+0. Item
+
+text
+
+1. Item {MD029}
+2. Item {MD029}
+3. Item {MD029}
+
+text
+
+4. Item {MD029}
+5. Item {MD029}
+
+text
+
+- Item
+  0. Item
+  0. Item
+  0. Item
+- Item
+  1. Item {MD029}
+  2. Item {MD029}
+  3. Item {MD029}
+- Item
+  0. Item
+  1. Item {MD029}
+  2. Item {MD029}
+- Item