run_tests: A script to test an implementation on the testcases
Fix expected outputs for blockquotes as per the spec
Fix expected outputs for codeblocks as per the spec
run_tests: Support running custom code to normalize the html

The custom code should be placed in the testcase directory
as 'normalize.py'.
normalize.py for testing lists
Fix tests for ordered lists as per the spec
Fix tests for unordered lists as per the spec
Fix tests for paragraphs as per the spec
Fix tests for code spans as per the spec
Fix expected output for emphasis as per the spec
Fix tests for links as per the spec
Tests for verbatim HTML elements
Tests for images