Add test and docs for markdown tables

doc/markdown/markdown.md

@@ -27,8 +27,9 @@ Table of Contents
 [Inline HTML](#toc_25)
 [Horizontal Rule](#toc_26)
 [Line Breaks](#toc_27)
-[References](#toc_28)
+[Tables](#toc_28)
+[References](#toc_29)
 ---------------------
 ----------------------------------------------
@@ -440,6 +441,26 @@ This line is separated from the one above by two newlines, so it will be a *sepa
 This line is also begins a separate paragraph, but...  
 This line is only separated by a single newline, so it's a separate line in the *same paragraph*.
+
+## Tables
+
+Tables aren't part of the core Markdown spec, but they are part of GFM and Markdown Here supports them.
+
+```
+| header 1 | header 2 |
+| -------- | -------- |
+| cell 1   | cell 2   |
+| cell 3   | cell 4   |
+```
+
+Code above produces next output:
+
+| header 1 | header 2 |
+| -------- | -------- |
+| cell 1   | cell 2   |
+| cell 3   | cell 4   |
+
+
 ------------
 <a name="references"/>

spec/helpers/gitlab_markdown_helper_spec.rb

@@ -366,6 +366,15 @@ describe GitlabMarkdownHelper do
       markdown(actual).should match(%r{Apply <em><a.+>!#{merge_request.iid}</a></em>})
     end
+    it "should handle tables" do
+      actual = %Q{| header 1 | header 2 |
+| -------- | -------- |
+| cell 1   | cell 2   |
+| cell 3   | cell 4   |}
+
+      markdown(actual).should match(/\A<table/)
+    end
+
     it "should leave code blocks untouched" do
       helper.stub(:user_color_scheme_class).and_return(:white)