always serialize out HTML content to a separate .html file
add test files
update comments and some code violation drive by fixes
add another piece of test data. just an img tag.
disable the 'dont verify HTML modules' in test_export.py. This better traps the bug whereby XML-parseable HTML content was being dropped on export serialization
Merge pull request #756 from edx/fix/cdodge/incorrect-html-serialization

Fix/cdodge/incorrect html serialization